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9. The girl uses a pusheart with wheels to move her items. Why do you think there are wheels in the push cart?
a to make frietion greater b. to lessen the friction c. to add the weight of the object d. lessen the weight of the object
10. What will happen to the movement of an object if the surface is rough and there is greater friction?
a. The object will move faster. b. The object will move slower, c. The movement remains the same, d. There is no effect in the movement
11. You are a member of the scout and you try to make fire by rubbing two pieces of wood. What force makes the fire?
A friction B. gravity C. lighter D. matchsticks
12. Which of the following best describes the gravity?
a. A force that attracts one mass to another, b. It is produced when you rub two things together. c. It makes things possible to fly d. Refers to the resistance created by two objects sliding against each other.
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