1) What is friction? a) A push or pull that makes objects move b) A force that opposes motion between two surfaces c) The energy that makes objects move faster d) The attraction between two objects 2) Which surface will produce the least friction? a) glass surface b) wood surface c) concrete surface d) wet surface 3) What happens to friction when oil or grease is added between two surfaces? a) Friction increases b) Friction decreases c) To increase friction and prevent slipping d) To make them move faster 4) What happens to friction when sand is added on a floor? a) Friction increases b) Friction decreases c) Friction stays the same d) Friction disappears completely 5) A toy car rolls farther on a tiled floor than on a rough mat. a) TRUE b) FALSE

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