1) What forces act on the car in drawing A? a) Thrust and air resistance b) Gravity and support force c) Friction and thrust d) Gravity and air resistance 2) Are the forces on the car in drawing A balanced or unbalanced? a) Unbalanced b) Balanced c) Only forward d) Only backward 3) Which forces act on the car at top speed (drawing E)? a) Gravity and support force only b) Thrust and friction only c) Gravity, support, thrust, air resistance, friction d) Air resistance only 4) In which pictures is the forward force bigger than the backward force? a) A and E b) C only c) B and D d) D and E 5) In which picture is the backward force bigger than the forward force? a) B b) C c) D d) E 6) In which pictures are the forward and backward forces balanced? a) B and D b) C only c) A and E d) D only 7) Where is air resistance smaller? a) A b) B c) C d) D 8) Where is air resistance larger? a) B b) C c) D d) E 9) What force helps the car go around a bend? a) Gravity b) Thrust c) Friction d) Air resistance 10) What happens to the car when forces are unbalanced? a) It stops moving b) It changes speed or direction c) Nothing happens d) It moves at steady speed

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