MCAT Physical : Work
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Example Question #11 : Work, Energy, And Power
A 
This question can be answered using conservation of energy. Having an understanding of the work-energy theorem allows us the knowledge that changing kinetic energy is a form of work, and that work can be a form of energy. In this particular question, the only force acting on the block to slow it down is the force of friction from the rough surface. As we know, work is equal to force times distance.
Because the block started with a certain amount of kinetic energy, and then is brought to a complete stop, all of that kinetic energy is transferred to work done by the force of friction over a distance of six meters.
Because the 
The kinetic energy is completely converted to the work done by friction.
We can then use the first equation for work to determine the force of friction.
Example Question #11 : Work, Energy, And Power
A 2kg box slides down a ramp a distance of two meters before it reaches the ground. The ramp has an angle of 
What is the work done on the box by friction?
Because the force of friction is parallel to the displacement of the box, we can solve for the work done by friction using the following equation.
Now, we need to define the force of friction or 
In this formula, 
Insert the value of acceleration due to gravity for 
Now, we can solve for the work done by friction.
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