Download CP Physics - Ms. Lisa Cole-

Honors Physics
Review Sheet-Work, Energy, and Power
Name_____________________
Vocabulary: Fill in the blank.
1. What 2 conditions must be met in order for work to be done?
2. The unit for work is the ______.
3. Is work a vector or a scalar quantity?
4. The rate at which work is done is called _______________.
5. A J/s is the same as a _______.
6. Work is the transfer of _______________.
7. The unit of energy is the _______________.
8. The energy an object has by virtue of its location is its ______________ _______________
energy.
9. The energy an object has by virtue of its motion is its _______________ energy.
10. The _________________________________ states that there is no net loss or gain of
energy when it transforms from one form to another.
11. __________________ changes some potential energy into ___________ before it can
become kinetic energy.
12. Energy is the ability to do _____________.
13. If a car’s speed is doubled, its kinetic energy will _____________________.
14. If a car’s speed is doubled, its momentum will ______________________.
15. List five other forms of energy.
16. Write the formulas for kinetic and potential energy.
Problems. Solve the following problems.
1. Relative to the ground below, how many joules of PE does a 1000 N boulder have at the top
of a 5 m ledge? If it falls, with how much KE will it strike the ground? What will be its speed at
impact?
2. A 1600 kg car travels at a speed of 12.5 m/s. What is its kinetic energy?
3. A 500 kg roller coaster car is pulled to the top of a hill 45 m high and arrives at the top with
zero speed. How much work is done by the chain that pulls the car to the top?
4. How fast will the car be going when it gets back to ground level, 45 m below?
5. How fast will the car go at a point 29 m above the ground?
6. A pole vaulter wishes to clear a 4 m bar. How fast must she run? (Assume that all of her KE
is converted to PE).
7. A 98 N sack of grain is hoisted to a storage room 50 m above the ground floor of a grain
elevator.
 How much work is required?

What is the potential energy of the sack of grain at this height?

What is the mass of the sack of grain?

The rope breaks just as the sack reaches the storage room. What kinetic energy does the
sack have just before it reaches the ground?

What is the sack’s velocity just before it hits the ground?