1) what is force? a) pull b) push c) push and push   d) None of these 2)  Magnetic force is a) contact force b) non-contact force c) both d) none of these 3) Force acts on an object may change a) direction b) shape c) speed d) all of above 4) Leaves or fruits fall on the ground due to a) magnetic force b) gravitational force c) electrostatic force d) muscular force 5) Which of the following is NOT a force? a) newton  b) friction c) gravity  d) magnetism 6) What force slows a skateboard when a skateboarder puts a foot down to brake? a) motion  b) friction c) gravity  d) magnetism 7) Friction is a _______ a) non-contact force b) contact force c) magnetic force d) electrostatic force 8) Friction always _______ a) a)opposes the motion b) (b) helps the motion c) both (a) and (b) d) none of these 9) Friction can be reduced by using ______ a) oil b) grease c) powder d) all of these 10) Force of friction depends on _______ a) roughness of surface b) weight c) size d) all of these 11) What is the net force and direction? a) 25N Left b) 25N Right c) 75N Left d) 75 N Right 12) If there are two forces going in the same direction how would you find the net force? a) Subtract  b) Add c) Multiply d) neither 13) 8N to the left, and 4N to the right. Find the net force. Is this balanced? a) 12N Right No b) 12N Right Yes c) 4N Left No d) 4N Right Yes 14) Find the net force:15 Nto the right, and another 15 newtons to the right. a) 0 N Right  b) 30 N Left  c) 0 N Left d) 30 N Right 15) .Unit of force in (SI ) is______ a) Meter  b) Newton c) Kilogram d) Joule

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