Potential and Kinetic Energy Problems.
Do these in your notebook.
1. A 0.2 kg apple in a tree that is 10 m high, has what potential energy?
2. A 0.2 kg apple in a tree that is 5 m high has what potential energy?
3. When the apple in the previous problem hits the ground, what is its potential energy?
4. A 600 kg roller coaster at the top of the highest point on its track which is 50 m, has what potential energy?
5. If the roller coaster in the previous problem went down the track to half of its highest hight, what would its potential energy be?
6. If the roller coaster goes all the way to its lowest point, what is the potential energy of the roller coaster?
7. A 3 kg ball is rolling 2 m/s. How much kinetic energy does it have?
8. Determine the kinetic energy of a 600-kg roller coaster car that is moving with a speed of 20 m/s.
9. If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy?
10. If the roller coaster car in the above problem came to a stop, what would its kinetic energy be?
Tricky Problems
11. Missy Diwater, the former platform diver for the Ringling Brother’s Circus, had a kinetic energy of 12 000 J just prior to hitting the bucket of water. If Missy’s mass is 40 kg, then what is her speed?
12. A 900-kg compact car moving at 60 mi/hr has approximately 320 000 Joules of kinetic energy. Estimate its new kinetic energy if it is moving at 30 mi/hr.
13. What is the kinetic energy of a 0.2 kg apple that falls from a 10 m high tree? What is the apple’s energy when it is 5 m above the ground?