1. What certain force keeps our feet from sliding when we are walking, running and jumping?
A Energy
B. Friction
C. Gravity
D Motion
2. Which situation below shows the disadvantage of friction?
A. breaks stopping a car C. allows a car engine to start
B. enables a person to walk D. exerting more energy when travelling on a rough road
3. What is the form of energy stored in the dry cells?
A chemicals B. electrical C gravitational
D. light
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Answer:
1. gravity
2. a
3. chemicals