Download Energy Worksheet - Kinetic, Potential, and Elastic

Work Energy and Conservation
KE = ½ m v2
Unit of measure = J (joule)
PE(g)= mgh
W = Fd
P = W/t = E/t
g = 9.8 m/s2
1. An object with mass = 5 kg is moving at a velocity of 10 m/s. What is the kinetic energy?
2. An object has a K.E. of 45 J and a velocity of 3 m/s. What is the mass?
3. An object with a mass of 2 kg has a K.E. of 36 J. What is the velocity?
4. A rock with a mass of 10 kg sits at the top of a hill 20 m high. What is the potential energy?
5. An object with mass of 2 kg is moving at a velocity of 2 m/s. What is the K.E.?
6. A rock climber is 30 m above the ground. If the mass of the climber is 90 kg, what is his P.E.?
7. A rock with a mass of 3 kg sits atop a cliff that is 17 m tall. What is its potential energy?
8. The rock from question #7 falls to the bottom of the cliff. Just before it hits, its velocity is 18.25
m/s. What is it’s kinetic energy?
9. How do the potential and kinetic energies of questions #7 and #8 compare? Why is this?
10. A skateboard with a mass of 2 kg and a velocity of 7 m/s moves up a quarter pipe. How high
does it get?
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Physics 100 Roller coaster Conservation of Energy
1. Describe how the concepts of energy, work, and conservation of energy can be applied to the roller
coaster. Your response should identify the different types of energy, where energy transformations
occur, and how energy enters and leaves a system (hint: Brakes)
2. Determine Li Ping Phar's (a mass of approximately 50 kg) speed at locations B, C, D and E.