Academic Physics
Work, Energy, and Power Test Review
1. Terms to know: energy, work-energy theorem, gravitational potential energy, kinetic energy, power,
reference level, ,watt, joule, mechanical energy, system,
2. Define: a) work-the force applied to an object multiplied by the distance the object moves in the
direction of the force
b) Power-the rate in which work is done
c) Energy-the ability to do work
3. State: Law of Conservation of Energy-Energy cannot be created or destroyed, it can only change form
4. What are two conditions necessary for “doing work?”
1. A force must be applied
2. The object must move in the direction of the applied force
5. State the units for each quantity below and whether the quantity is scalar or vector.
a) Work-Joules “J”
b) Power-Watts “W”
c) Energy-Joules “J”
6. As the time it takes to lift an object decreases, what happens to:
a) The work done in lifting the object?- Work Stays the same
b) The power exerted by the person lifting it?-Power increases
7. How does the amount of gravitational potential energy an object has effect the amount of kinetic
energy of the object? The amount of gravitational potential energy is the amount of energy that can be
converted to kinetic energy
8. What is work? the force applied to an object multiplied by the distance the object moves in the
direction of the force
9. What is the S.I. unit for work? What formula is used to calculate work? Joules: W=F X D
10. What is energy? the ability to do work
11. What is the S.I. unit for energy? Joules
12. What is the difference between kinetic and potential energy-kinetic energy is energy due to motion,
while potential energy is stored energy
13. What is power? Is the rate in which work is done
14. What is the S.I. unit of power? Watts “W”
15. What formula is used to calculate power? P=W/T
