Why doesn't Newton's third law mean a person bounces back to where they started when they hit the ground?With...
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Why doesn't Newton's third law mean a person bounces back to where they started when they hit the ground?
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Why doesn't a person bounce back after falling down like a ball? If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction. If we take the example of ball then it comes back with the same force as it falls down.But in the case of a human body, this law is not applicable. Why?
newtonian-mechanics forces conservation-laws collision free-body-diagram
New contributor
$endgroup$
add a comment |
$begingroup$
Why doesn't a person bounce back after falling down like a ball? If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction. If we take the example of ball then it comes back with the same force as it falls down.But in the case of a human body, this law is not applicable. Why?
newtonian-mechanics forces conservation-laws collision free-body-diagram
New contributor
$endgroup$
$begingroup$
Related: physics.stackexchange.com/q/45653/2451 and links therein.
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– Qmechanic♦
13 hours ago
3
$begingroup$
A ball does not come back with exactly the same force: youtube.com/watch?v=xXXF2C-vrQE
$endgroup$
– StrongBad
9 hours ago
2
$begingroup$
The law applies to human bodies. But the law doesn't apply to energy. It applies to force. Force isn't the same thing as energy. It isn't force that's gone missing here. It's energy. Ask where the energy went. We have conservation of energy so it's gotta be here somewhere.
$endgroup$
– candied_orange
8 hours ago
add a comment |
$begingroup$
Why doesn't a person bounce back after falling down like a ball? If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction. If we take the example of ball then it comes back with the same force as it falls down.But in the case of a human body, this law is not applicable. Why?
newtonian-mechanics forces conservation-laws collision free-body-diagram
New contributor
$endgroup$
Why doesn't a person bounce back after falling down like a ball? If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction. If we take the example of ball then it comes back with the same force as it falls down.But in the case of a human body, this law is not applicable. Why?
newtonian-mechanics forces conservation-laws collision free-body-diagram
newtonian-mechanics forces conservation-laws collision free-body-diagram
New contributor
New contributor
edited 2 hours ago
Aaron Stevens
14.5k42453
14.5k42453
New contributor
asked 14 hours ago
nameera jabeennameera jabeen
593
593
New contributor
New contributor
$begingroup$
Related: physics.stackexchange.com/q/45653/2451 and links therein.
$endgroup$
– Qmechanic♦
13 hours ago
3
$begingroup$
A ball does not come back with exactly the same force: youtube.com/watch?v=xXXF2C-vrQE
$endgroup$
– StrongBad
9 hours ago
2
$begingroup$
The law applies to human bodies. But the law doesn't apply to energy. It applies to force. Force isn't the same thing as energy. It isn't force that's gone missing here. It's energy. Ask where the energy went. We have conservation of energy so it's gotta be here somewhere.
$endgroup$
– candied_orange
8 hours ago
add a comment |
$begingroup$
Related: physics.stackexchange.com/q/45653/2451 and links therein.
$endgroup$
– Qmechanic♦
13 hours ago
3
$begingroup$
A ball does not come back with exactly the same force: youtube.com/watch?v=xXXF2C-vrQE
$endgroup$
– StrongBad
9 hours ago
2
$begingroup$
The law applies to human bodies. But the law doesn't apply to energy. It applies to force. Force isn't the same thing as energy. It isn't force that's gone missing here. It's energy. Ask where the energy went. We have conservation of energy so it's gotta be here somewhere.
$endgroup$
– candied_orange
8 hours ago
$begingroup$
Related: physics.stackexchange.com/q/45653/2451 and links therein.
$endgroup$
– Qmechanic♦
13 hours ago
$begingroup$
Related: physics.stackexchange.com/q/45653/2451 and links therein.
$endgroup$
– Qmechanic♦
13 hours ago
3
3
$begingroup$
A ball does not come back with exactly the same force: youtube.com/watch?v=xXXF2C-vrQE
$endgroup$
– StrongBad
9 hours ago
$begingroup$
A ball does not come back with exactly the same force: youtube.com/watch?v=xXXF2C-vrQE
$endgroup$
– StrongBad
9 hours ago
2
2
$begingroup$
The law applies to human bodies. But the law doesn't apply to energy. It applies to force. Force isn't the same thing as energy. It isn't force that's gone missing here. It's energy. Ask where the energy went. We have conservation of energy so it's gotta be here somewhere.
$endgroup$
– candied_orange
8 hours ago
$begingroup$
The law applies to human bodies. But the law doesn't apply to energy. It applies to force. Force isn't the same thing as energy. It isn't force that's gone missing here. It's energy. Ask where the energy went. We have conservation of energy so it's gotta be here somewhere.
$endgroup$
– candied_orange
8 hours ago
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
Newton's third law just says when the person is hitting the floor the force the person exerts on the ground is equal to the force the ground exerts on the person. i.e. all forces are interactions.
Newton's third law does not say that all collisions are elastic, which is what you are proposing. When someone hits the floor most of the energy is absorbed by the person through deformation (as well as the floor, depending on what type of floor it is), but there is barely any rebound since people tend to not be very elastic. i.e. the deformation does not involve storing the energy to be released back into kinetic energy. Contrast this with a bouncy ball where much of the energy goes into deforming the ball, but since it is very elastic it is able to spring back and put energy back into motion. However, it is unlikely the collision is still perfectly elastic, as you seem to suggest in your question.
Your misunderstanding likely comes from the imprecise usage of the words "action" and "reaction". In this case, these words refer to just forces, not entire processes. You can get some confusing questions if you don't understand this. For example, why is it that when I open my refrigerator that my refrigerator doesn't also open me?
$endgroup$
8
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
8
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
2
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
|
show 1 more comment
$begingroup$
When you body hits the floor, it does receive an equal and opposite reaction force from the floor. But unlike a ball a body is an complex object. So not all energy is transferred back as kinetic energy. Some energy is used to produce sound, some is used to deform your body... etc. I think you are confusing force with energy. Does every ball bounce back the same amount? Newton's 3rd law talks about force only. More force doesn't always(mostly) equal to more work done.
In your case if all the force was used to change the body's kinetic energy somehow(which is not realistically possible), then it would have bounced back the same amount.
$endgroup$
add a comment |
$begingroup$
If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction.
That's not a correct statement of Newton's third law.
Newton's third law of motion actually says: "If one object exerts a force on another object, then the second object also exerts a force on the first object, which is of the same magnitude but in the opposite direction."
So in this case, what Newton's third law is saying is: "If the floor pushes up on a person with a certain amount of force, then the person pushes down on the floor with the same amount of force." From this, there's no reason to think that the person would bounce back to his initial position.
$endgroup$
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Newton's third law just says when the person is hitting the floor the force the person exerts on the ground is equal to the force the ground exerts on the person. i.e. all forces are interactions.
Newton's third law does not say that all collisions are elastic, which is what you are proposing. When someone hits the floor most of the energy is absorbed by the person through deformation (as well as the floor, depending on what type of floor it is), but there is barely any rebound since people tend to not be very elastic. i.e. the deformation does not involve storing the energy to be released back into kinetic energy. Contrast this with a bouncy ball where much of the energy goes into deforming the ball, but since it is very elastic it is able to spring back and put energy back into motion. However, it is unlikely the collision is still perfectly elastic, as you seem to suggest in your question.
Your misunderstanding likely comes from the imprecise usage of the words "action" and "reaction". In this case, these words refer to just forces, not entire processes. You can get some confusing questions if you don't understand this. For example, why is it that when I open my refrigerator that my refrigerator doesn't also open me?
$endgroup$
8
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
8
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
2
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
|
show 1 more comment
$begingroup$
Newton's third law just says when the person is hitting the floor the force the person exerts on the ground is equal to the force the ground exerts on the person. i.e. all forces are interactions.
Newton's third law does not say that all collisions are elastic, which is what you are proposing. When someone hits the floor most of the energy is absorbed by the person through deformation (as well as the floor, depending on what type of floor it is), but there is barely any rebound since people tend to not be very elastic. i.e. the deformation does not involve storing the energy to be released back into kinetic energy. Contrast this with a bouncy ball where much of the energy goes into deforming the ball, but since it is very elastic it is able to spring back and put energy back into motion. However, it is unlikely the collision is still perfectly elastic, as you seem to suggest in your question.
Your misunderstanding likely comes from the imprecise usage of the words "action" and "reaction". In this case, these words refer to just forces, not entire processes. You can get some confusing questions if you don't understand this. For example, why is it that when I open my refrigerator that my refrigerator doesn't also open me?
$endgroup$
8
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
8
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
2
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
|
show 1 more comment
$begingroup$
Newton's third law just says when the person is hitting the floor the force the person exerts on the ground is equal to the force the ground exerts on the person. i.e. all forces are interactions.
Newton's third law does not say that all collisions are elastic, which is what you are proposing. When someone hits the floor most of the energy is absorbed by the person through deformation (as well as the floor, depending on what type of floor it is), but there is barely any rebound since people tend to not be very elastic. i.e. the deformation does not involve storing the energy to be released back into kinetic energy. Contrast this with a bouncy ball where much of the energy goes into deforming the ball, but since it is very elastic it is able to spring back and put energy back into motion. However, it is unlikely the collision is still perfectly elastic, as you seem to suggest in your question.
Your misunderstanding likely comes from the imprecise usage of the words "action" and "reaction". In this case, these words refer to just forces, not entire processes. You can get some confusing questions if you don't understand this. For example, why is it that when I open my refrigerator that my refrigerator doesn't also open me?
$endgroup$
Newton's third law just says when the person is hitting the floor the force the person exerts on the ground is equal to the force the ground exerts on the person. i.e. all forces are interactions.
Newton's third law does not say that all collisions are elastic, which is what you are proposing. When someone hits the floor most of the energy is absorbed by the person through deformation (as well as the floor, depending on what type of floor it is), but there is barely any rebound since people tend to not be very elastic. i.e. the deformation does not involve storing the energy to be released back into kinetic energy. Contrast this with a bouncy ball where much of the energy goes into deforming the ball, but since it is very elastic it is able to spring back and put energy back into motion. However, it is unlikely the collision is still perfectly elastic, as you seem to suggest in your question.
Your misunderstanding likely comes from the imprecise usage of the words "action" and "reaction". In this case, these words refer to just forces, not entire processes. You can get some confusing questions if you don't understand this. For example, why is it that when I open my refrigerator that my refrigerator doesn't also open me?
edited 7 hours ago
answered 13 hours ago
Aaron StevensAaron Stevens
14.5k42453
14.5k42453
8
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
8
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
2
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
|
show 1 more comment
8
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
8
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
2
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
8
8
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
$begingroup$
Well, I can’t speak for you, but when I open my refrigerator my mouth invariably opens in return—I had always thought it was in anticipation of what is to follow, but perhaps the refrigerator had been returning the gesture after all !
$endgroup$
– eggyal
11 hours ago
8
8
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
And, in fact, we cannot make persons more elastic but we can do it with the floor. In general, we call them trampolins. A person falling in a trampoline is very likely to bounce =)
$endgroup$
– jean
10 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
$begingroup$
@DavidRicherby I suppose it depends on the type of floor as well, but that is a good point. I'll make an edit.
$endgroup$
– Aaron Stevens
7 hours ago
2
2
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
That's deep. I'm going to tweak it and use it to sound wise. "When you take something out of the refrigerator, the refrigerator takes something out of you."
$endgroup$
– Lofty Withers
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
$begingroup$
If you're going to call a trampoline a floor, I get to call a pogostick rider a person
$endgroup$
– Foon
6 hours ago
|
show 1 more comment
$begingroup$
When you body hits the floor, it does receive an equal and opposite reaction force from the floor. But unlike a ball a body is an complex object. So not all energy is transferred back as kinetic energy. Some energy is used to produce sound, some is used to deform your body... etc. I think you are confusing force with energy. Does every ball bounce back the same amount? Newton's 3rd law talks about force only. More force doesn't always(mostly) equal to more work done.
In your case if all the force was used to change the body's kinetic energy somehow(which is not realistically possible), then it would have bounced back the same amount.
$endgroup$
add a comment |
$begingroup$
When you body hits the floor, it does receive an equal and opposite reaction force from the floor. But unlike a ball a body is an complex object. So not all energy is transferred back as kinetic energy. Some energy is used to produce sound, some is used to deform your body... etc. I think you are confusing force with energy. Does every ball bounce back the same amount? Newton's 3rd law talks about force only. More force doesn't always(mostly) equal to more work done.
In your case if all the force was used to change the body's kinetic energy somehow(which is not realistically possible), then it would have bounced back the same amount.
$endgroup$
add a comment |
$begingroup$
When you body hits the floor, it does receive an equal and opposite reaction force from the floor. But unlike a ball a body is an complex object. So not all energy is transferred back as kinetic energy. Some energy is used to produce sound, some is used to deform your body... etc. I think you are confusing force with energy. Does every ball bounce back the same amount? Newton's 3rd law talks about force only. More force doesn't always(mostly) equal to more work done.
In your case if all the force was used to change the body's kinetic energy somehow(which is not realistically possible), then it would have bounced back the same amount.
$endgroup$
When you body hits the floor, it does receive an equal and opposite reaction force from the floor. But unlike a ball a body is an complex object. So not all energy is transferred back as kinetic energy. Some energy is used to produce sound, some is used to deform your body... etc. I think you are confusing force with energy. Does every ball bounce back the same amount? Newton's 3rd law talks about force only. More force doesn't always(mostly) equal to more work done.
In your case if all the force was used to change the body's kinetic energy somehow(which is not realistically possible), then it would have bounced back the same amount.
answered 13 hours ago
LikhonLikhon
1069
1069
add a comment |
add a comment |
$begingroup$
If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction.
That's not a correct statement of Newton's third law.
Newton's third law of motion actually says: "If one object exerts a force on another object, then the second object also exerts a force on the first object, which is of the same magnitude but in the opposite direction."
So in this case, what Newton's third law is saying is: "If the floor pushes up on a person with a certain amount of force, then the person pushes down on the floor with the same amount of force." From this, there's no reason to think that the person would bounce back to his initial position.
$endgroup$
add a comment |
$begingroup$
If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction.
That's not a correct statement of Newton's third law.
Newton's third law of motion actually says: "If one object exerts a force on another object, then the second object also exerts a force on the first object, which is of the same magnitude but in the opposite direction."
So in this case, what Newton's third law is saying is: "If the floor pushes up on a person with a certain amount of force, then the person pushes down on the floor with the same amount of force." From this, there's no reason to think that the person would bounce back to his initial position.
$endgroup$
add a comment |
$begingroup$
If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction.
That's not a correct statement of Newton's third law.
Newton's third law of motion actually says: "If one object exerts a force on another object, then the second object also exerts a force on the first object, which is of the same magnitude but in the opposite direction."
So in this case, what Newton's third law is saying is: "If the floor pushes up on a person with a certain amount of force, then the person pushes down on the floor with the same amount of force." From this, there's no reason to think that the person would bounce back to his initial position.
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If we push a person and he falls down then why doesn't he come back to its initial position. Although according to Newton's 3rd law of motion: To every action there is always equal but opposite reaction.
That's not a correct statement of Newton's third law.
Newton's third law of motion actually says: "If one object exerts a force on another object, then the second object also exerts a force on the first object, which is of the same magnitude but in the opposite direction."
So in this case, what Newton's third law is saying is: "If the floor pushes up on a person with a certain amount of force, then the person pushes down on the floor with the same amount of force." From this, there's no reason to think that the person would bounce back to his initial position.
answered 5 hours ago
Tanner SwettTanner Swett
1518
1518
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nameera jabeen is a new contributor. Be nice, and check out our Code of Conduct.
nameera jabeen is a new contributor. Be nice, and check out our Code of Conduct.
nameera jabeen is a new contributor. Be nice, and check out our Code of Conduct.
nameera jabeen is a new contributor. Be nice, and check out our Code of Conduct.
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Related: physics.stackexchange.com/q/45653/2451 and links therein.
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– Qmechanic♦
13 hours ago
3
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A ball does not come back with exactly the same force: youtube.com/watch?v=xXXF2C-vrQE
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– StrongBad
9 hours ago
2
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The law applies to human bodies. But the law doesn't apply to energy. It applies to force. Force isn't the same thing as energy. It isn't force that's gone missing here. It's energy. Ask where the energy went. We have conservation of energy so it's gotta be here somewhere.
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– candied_orange
8 hours ago