All Questions
Tagged with free-body-diagram conservation-laws
33
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Is there any phenomenon where opposite reaction (Newton's 3rd Law) is not fulfilled?
I'm wondering if there is any case in nature/physics where it has been observed "where there is an action, there is not necessarily an exact equal and opposite reaction".
Or is there some ...
- 193
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174
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How is Newton's 3rd law applied in rocket propulsion?
I'm really wanting to get into physics more and I've had this question for a while. I do know a bit about rocketry as I think it's pretty cool but I'm still struggling to understand how Newton's 3rd ...
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1
answer
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Breakage of a support during rotation [closed]
This is a trivial question and probably already asked elsewhere, but not being a native English speaker I struggle to use effective keywords.
In any case, we have a thin homogeneous rod resting on a ...
- 117
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Space Symmetry and Conservation of Linear Momentum
I am trying to understand Noether's Theorem which links Space Symmetry and Conservation of Linear Momentum from an intuitive perspective.
Let's say we have car rolling down a frictionless surface ...
- 253
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2
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59
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How does conservation of momentum apply practically?
I'm doing AP Physics mechanics and I'm learning about the conservation of momentum and the textbook describes the conditions for it's validity as the net force on the system must be 0. I understand ...
- 299
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Is momentum conserved when all the surfaces are smooth?
In general sense momentum conservation is making sense to me almost everywhere but when in physics problems scenarios where all surfaces become smooth and the objects are just gliding over one another ...
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3
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Can we conserve angular momentum in pure translation motion?
suppose a block is moving on a surface with velocity v paraller to the surface. the surface is rough and is exerting some frictional force on block.
consider the point 'O' in above image. since net ...
- 379
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How can the momentum be conserved in $y$ direction here?
In this question,
A circus acrobat of mass $M$ leaps straight up with initial velocity $v_0$ from a trampoline. As he rises up, he takes a trained monkey of mass $m$ off a perch at a height $h$ above ...
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How can a marble on a circular track return to its point of origin using only its own momentum?
A marble rolling on a curved track appears to violate conservation of momentum. Please help me understand why this is illusion and/or what mechanism is acting such that momentum is cancelled and ...
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5
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Newton's 3rd law and propellantless propulsion
I was thinking lately about a potential misunderstanding regarding Newton's $3^\text{rd}$ law and the supposed impossibility of creating a device that moves by utilizing just internal forces (...
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How does Newton's third law hold up when a block kept on a table breaks the table?
Suppose there's a block of some mass that is kept on a table. But, instead of staying at rest on the table, it breaks through the table. How does Newton's third law hold up here?
If the block is at ...
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2
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4
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Friction on a car
I wanted to ask why doesn't the car move on a frictionless surface. Suppose you are on a frictionless surface When you press the accelerator the wheels start rotating and apply a force to the ground. ...
- 408
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4
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Conservation of momentum in a newton’s cradle with inelastic collisions
Let's consider that we have a Newton's cradle in vacuum:
Considering that each ball has a mass of 100g or 0.1 kg we release the ball and at the time of contact, the ball has a final velocity of 1 m/s....
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3
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123
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How do we predict the motion of this systems using Newton's laws of Motion?
This question should be seen as an argument for these Answers. I want you to read the answers to this following question before answering it.
Violating Newtons First Law!
Here Everybody is saying CM ...
19
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6
answers
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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?
When we drop a ball, it bounces back to the spot where we dropped it, due to the reaction forces exerted on it by the ground. However, if a person falls down (say, if we push them), why don't they ...
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