Friction or some force acting on momentum of an object

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Homework Help Overview

The discussion revolves around the effects of forces such as friction and air resistance on the momentum of an object. Participants explore whether these forces increase or decrease momentum, considering various scenarios and reference frames.

Discussion Character

  • Conceptual clarification, Assumption checking, Mixed

Approaches and Questions Raised

  • Participants discuss the relationship between forces and momentum, questioning how the direction of the force affects momentum. Some consider the implications of different reference frames on the behavior of momentum under the influence of friction.

Discussion Status

The conversation is active, with participants offering insights and examples. There is a recognition of the complexity of the topic, particularly regarding the influence of reference frames and the dual nature of forces like friction in different contexts.

Contextual Notes

Some participants note the importance of the reference frame in determining the effect of forces on momentum, suggesting that assumptions about directionality and context may lead to different interpretations.

parwana
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Would forces like friction and air resistance increase momentum or decrease it?

I would think if a force acts on momentum it would decrease the momentum of an object. Is that right?

P= mv

P= Ft
 
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It depends on the direction of the force with respect to velocity. In the case of friction and air resistance, the absolute value of the momentum will always decrease, yes.

It should be noted that if the momentum is negative, it will actually increase
 
Of course it would decrease it, but this is assuming a certain refrence frame.
If for some reason the refrence frame were moving, then friction could increase momentum.
 
or I guess it could decrease it and then start increasing it.

<<just to confuse you :) >>
 
I am sure you are familiar with friction decreasing momentum. An example of friction inceasing momentum would be the way a car accelerates. The force that pushes the car forward is actually friction from the road on the tyre. The car accelerates and increases its momentum.
 

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