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2. Inclined plane
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3. Wheel and axle
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4. Screw
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5. Wedge
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6. Pulley
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D. Answer the following questions.
1. What do you understand by force? Explain!
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2. What are the types of forces?
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3. What is the force of gravity.
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4. What is work?
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5. What is a simple machine?
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6. What is potential energy?
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7. What is kinetic energy? Explain!
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8. Explain the various forms of energy.
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