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Sagot :
Answer:
1.B. FRICTION: is a force that works against motion; the action of one surface or object rubbing against another surface or object. Friction stops or slows down moving objects. Friction can help moving objects change direction.
2.B. SANDY FLOOR
3.C. Rough SURFACE
Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.
4.D.GRASS
5.D.increasing air resistance that slows down its motion
Explanation:
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