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The FA
1. Rilla Fordable does 312 J of work exerting 54.0 N of force for what distance?
(5.78m)
2. What speed must a 0.458 kg hammer go to have 60.0 J of kinetic energy?
(16.2 m/s)
3. What is the potential energy of a 2.60 kg clock weight that is 1.45 m above its lowest point?
(37.0 J)
4. What is the kinetic energy of a 0.145 kg baseball going 40.0 m/s?
(116 J)
5. What distance must you stretch a 35.0 N/m spring to store exactly 5.00 J of energy?
(53.5 cm)
Worksheet 6.0:
Work: W = Fs
1. How much work does Fred do exerting 45.0 N to lift a box 3.20 m?
2. How much work does Adair lifting a 12.0 N box up 5.00 m? Video
3. An alkaline AA battery contains 9360 J of energy. If it takes 68.0 N of force to drag a heavy box across the floor, how far could the energy in a AA battery drag the box? Video
4. What vertical distance will 64.0 J of work lift a box that weighs 41.0 N
5. Katherine moves a box 7.20 m doing 5.00 J of work. What is the frictional force? Video
6. What force exerted for 4.10 m does 117 J of work?
Potential Energy: PE = mgh
7. What is the potential energy of a 5.40 Kg shot put that is 12.0 m in the air? Video
8. What is the potential energy of a 3.20 kg clock weight that has been wound up to a height of 0.680 m?
9. What is the mass of a pile driver if it has 13,200 J of PE when it is 8.30 m in the air? Video
10. What mass has a PE of 140. J when it is at an elevation of 0.210 m?
11. An alkaline AA battery contains 9360 J of energy. If I connected it to a 100% efficient winch, how high could it lift a 72.0 kg person? Video
12. To what height must a 0.145 Kg baseball rise to get a potential energy of 27.0 J?
Kinetic energy: KE = 1/2mv2
13.What is the kinetic energy of a 0.145 Kg baseball going 40.0 m/s? (about 90 mph) Video
14. What is the kinetic energy of a 4.20 g (0.0042 kg) bullet going 1120 m/s?
15.An alkaline AA battery contains 9360 J of energy. If I connected it to a 100% efficient pitching machine, how fast could it pitch a 0.145 kg baseball? Video
16. What speed must a 0.450 Kg hammer have to have a kinetic energy of 57.0. J?
17. A pile driver must develop 14,500 J of kinetic energy when it is going 13.0 m/s. What does its mass have to be?
18. A bullet with a speed of 892 m/s has a kinetic energy of 2740 J. What is its mass? Video
Springs: F = kx
19. What force do you need to stretch a 31.2 N/m spring 13.0 cm? Video
20. You hang a 200. gram mass on a spring, and it stretches 4.58 cm. What is its spring constant in N/m? (F = mg, 1000 g = 1 kg, 100 cm = 1 m) Video
21. If you exert 15.0 N on a spring with a constant of 47.0 N/m how many centimeters will it stretch? Video
Springs: PE = 1/2kx2
22. What is the energy stored in a bow with a constant of 371 N/m if you stretch it 67.0 cm? Video
23. A spring has a potential energy of 6.80 J when it is stretched 12.0 cm. What must be the spring constant? Video
24. What distance must you compress a 78.0 N/m spring to store 15.0 J of energy? Video
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