Download Unit 7 5 WPE Math worksheet

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POP Work, Power, and Energy Worksheet
***Must Write the equation used, show work, and box answer with units***
1. What is the potential energy of a 2-kilogram potted plant that is on a 2 meter-high plant stand?
2. The potential energy of an apple is 6.00 joules. The apple is 3.00-meters high. What is the mass
of the apple?
3. Determine the amount of potential energy of a 5-newton book that is moved to three different
shelves on a bookcase. The height of each shelf is 1.0 meter, 1.5 meters, and 2.0 meters.
4. Two objects were lifted by a machine. One object had a mass of 2 kilograms,
and was lifted at a speed of 2 m/sec. The other had a mass of 4 kilograms
and was lifted at a rate of 3 m/sec.
a. Which object had more kinetic energy while it was being lifted?
b. Which object had more potential energy when it was lifted to a distance of 10 meters?
5. You are on roller blades on top of a small hill. Your potential energy is equal to
1,000.0 joules. The last time you checked your mass was 60.0 kilograms.
a. What is your weight in newtons?
b. What is the height of the hill?
c. If you start skating down this hill, your GPE will be converted to ______
d. At the bottom of the hill, the KE will be _______ to your GPE at the top.
6. What is the potential energy of a 3 kilogram-ball that is on the ground?
7. Leroy Burrell set a world record in 1994 by running the 100 m dash with an average speed of
10.15 m/s. If his mass is 66 kg, how much kinetic energy did he exert?
8. If a skier has a mass of 51 kg and uses 9.96 x 10k J of energy to get down a hill, how fast were
they going?
9. You do 2.7 J of work by exerting 4.5 N on a book to move it across a table. How far did it go?
10. A 75 kg student runs up 3.2 m high stairs in 1.2 seconds. How much power did they use?
11. A 5 kg toy falls off a 0.75 m high table.
a. How much Kinetic Energy does the toy have just before hitting the ground?
b. How fast is it going just before hitting the ground?
12. If the mass of a moving object doubles, the Kinetic Energy of the object ______________.
13. If the velocity of a moving object doubles, the kinetic Energy of the object _____________.
14. If an object weighs 60N, how much is its mass?
Mechanical Advantage Formula Practice
1. What is the effort force needed to lift a 5000N car, using a jack with a mechanical
advantage of 20?
2. A block and tackle with a MA of 48 is used to lift a piano 11 m to the third floor of
a building. Although the arrangement of pulleys in the block and tackle makes it
easy to lift the piano, it takes a long time because of the length of rope that must be
pulled to lift the piano a small amount. What is this length, or input distance, of
the rope that must be pulled?
Efficiency Formula Practice
1. What is the efficiency if the output is 91 J and the input is 2173 J ?
2. What is the output force when the efficiency is 62 % and the input is 39 J ?
3. What is the input force when the output is 2841 J and the efficiency is 15 % ?