1) Which contact force acts in the opposite direction to a moving object? a) gravity b) weight c) friction d) upthrust 2) Which force did Sir Isaac Newton discover? a) gravity b) air resistance c) upthrust d) friction 3) Which is an example of unbalanced forces a) a duck floating on the water b) a car accelerating c) a bicycle that has stopped at traffic lights d) a girl that is walking at a constant speed 4) The resultant force in the picture is ... a) 100 N b) 400 N c) 300 N d) 700 N 5) In which direction will the ball move? a) up b) down c) left d) right 6) The falling man's weight is the downward force. What is the opposite force? a) upthrust b) air resistance c) gravity d) mass 7) What is happening to the Mystery Machine? a) it has stopped b) it is travelling at a constant speed c) it is moving forwards and speeding up d) it is reversing 8) Will the ball float or sink? a) float b) sink 9) Which force slows down the swimmer? a) upthrust b) gravity c) weight d) water resistance 10) Who is winning the tug of war? a) the boy in the yellow top b) the girl in the purple top

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