Question

Suppose you push a box, which is then slowed to rest by friction. Given displacement = 2m, time = 2.29s, and mass of box = 300g, find the Work done by friction to stop the box and initial kinetic energy.

Answer 1

Friction does negative work to bring the package to rest and remove its kinetic energy.

Step-by-step explanation:

We know that once the person stops pushing, friction will bring the package to rest. In terms of energy, friction does negative work until it has removed all of the package's kinetic energy. The work done by friction is the force of friction times the distance traveled times the cosine of the angle between the friction force and displacement; hence, this gives us a way of finding the distance traveled after the person stops pushing.