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PES Skill Sheets.book - Capital High School

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8. The middle gear turns left. The bottom gear turns right.<br />

9. 3 times<br />

10. 4 times<br />

<strong>Skill</strong> Sheet 7.1: Levers in the Human Body<br />

Lever A:<br />

1. Type of lever: Third-class lever.<br />

2. This lever is used to lift objects.<br />

Lever B:<br />

<strong>Skill</strong> Sheet 7.1: Bicycle Gear Ratios Project<br />

Students evaluate the gear ratios of their own bicycles to<br />

complete this project. Answers will vary.<br />

<strong>Skill</strong> Sheet 7.2: Potential and Kinetic Energy<br />

1. First shelf: 5.0 newton-meters<br />

Second shelf: 7.5 newton-meters<br />

Third shelf: 10. newton-meters<br />

2. Answers are:<br />

a. 588 newtons<br />

b. 1.7 meters<br />

c. 5.8 m/s<br />

<strong>Skill</strong> Sheet 7.2: Identifying Energy Transformations<br />

1. (1) Chemical energy from food to kinetic energy to elastic<br />

energy; (2) chemical energy from food to kinetic energy; (3)<br />

elastic energy to kinetic energy.<br />

2. Electrical energy to radiant (microwave) energy to kinetic<br />

energy (increased movement of molecules in the soup, which<br />

increases the soup’s temperature).<br />

3. Chemical energy from food to kinetic energy (as Dmitri<br />

operates the pump) to pressure energy.<br />

Page 22 of 57<br />

11. 1/2 time<br />

12. 6 times<br />

3. Type of lever: First-class lever.<br />

4. This lever is used to chew food.<br />

Lever C:<br />

5. Type of lever: Second-class lever.<br />

6. This lever is used to raise and lower the heel of the foot while<br />

standing.<br />

3. Answers are:<br />

a. 450 joules<br />

b. 450 joules<br />

c. 46 meters<br />

4. 25,000 joules<br />

5. 4 m/s<br />

6. 75 kilograms<br />

4. Chemical energy from the battery in controller to radiant<br />

energy (radio waves). Radio waves to electrical signal in car;<br />

chemical energy from car battery to kinetic energy as car<br />

moves.<br />

5. Chemical energy from food is transformed to kinetic energy<br />

which is transformed to potential energy as Adeline moves<br />

toward the top of the hill. As she coasts down the other side,<br />

potential energy is transformed to kinetic energy.

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