# Friction or some force acting on momentum of an object

• parwana
In summary, forces like friction and air resistance can decrease momentum by acting in the opposite direction of an object's velocity. However, depending on the reference frame, it is possible for friction to increase momentum. An example of this is a car accelerating due to the force of friction from the road on its tires.
parwana
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

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.

## What is friction?

Friction is a force that opposes the motion of an object when it comes into contact with another object or surface.

## How does friction affect the momentum of an object?

Friction acts in the direction opposite to the motion of an object, therefore it decreases the momentum of the object.

## What factors affect the amount of friction on an object?

The amount of friction on an object is affected by the type of surface the object is moving on, the roughness of the surface, and the force pressing the two surfaces together.

## What is the difference between static and kinetic friction?

Static friction is the force that prevents an object from moving when it is at rest, while kinetic friction is the force that opposes the motion of an object that is already moving.

## How can friction be reduced?

Friction can be reduced by using a lubricant, smoothing or polishing the surfaces, or by reducing the force pressing the two surfaces together.

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