How much work done if an object is moving to the right and a force of 75. 0n is applied at 125 degrees to the motion while the o
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Answer:
159 N
Explanation:
The force of friction is a resistive force that acts against an object in motion (or on the verge of moving).
There are two types of force of friction:
- Force of static friction: it occurs when the object is still at rest
- Force of kinetic friction: it occurs when the object is sliding on a surface and it is in motion
In this problem, we are in the 2nd situation, so we want to calculate the force of kinetic friction.
This force is given by:
where
is the coefficient of kinetic friction
N is the normal force exerted on the object
For the sled and the girl in this problem,
is the coefficient of kinetic friction
N = 636 N is the normal force
So the force of friction is