1) a push or pull a) gravity b) force c) magnetism d) speed 2) Which is not example of force? a) a swing at rest b) a batter hits a baseball c) a car turning at a stop sign d) a snowball rolling down a hill 3) The force of ______ can make a ball fall to the ground. a) magnets b) push c) speed d) gravity 4) stored energy in an object a) potential energy b) kinetic energy c) sitting d) mass 5) More mass = a) less potential energy b) more potential energy c) at rest d) motion 6) Kinetic energy = a) less speed b) stored energy c) magnetic d) the energy of motion 7) A bicycle at rest at the top of a hill has _______.  a) potential energy b) kinetic energy c) gravity d) magnetism 8) As a bicycle moves down a hill, the potential energy changes into ______. a) more potential energy b) less speed c) kinetic energy d) gravity 9) a non-contact force that doesn't require two objects to touch a) friction b) tension c) gravity 10) A force that pulls two objects toward each other a) gravity b) friction c) revolves d) standing 11) What force causes the moon to revolve around Earth? a) speed b) friction c) rotation d) gravity 12) A contact force that requires two objects to touch a) friction b) speed c) revolution d) gravity 13) Friction works against a) magnets b) motion c) gravel d) potential energy 14) Roller skates move easier on _____. a) smooth surfaces b) bumpy surfaces c) gravel d) carpet 15) Why do wheels work better on smooth surfaces? a) less friction b) more friction c) more potential energy d) less kinetic energy 16) What would be the best surface to skate on? a) tile b) carpet c) gravel d) wood mulch 17) Where would you see the most friction for roller skates? a) wood b) tile c) gravel 18) The rock shows _______. a) potential (stored) energy b) kinetic energy of motion c) magnetism d) friction 19) The arrow has ______. a) kinetic energy b) motion c) magnetism d) potential energy 20) What best explains what will happen when the ball is released? a) The potential energy remains stored. b) The potential energy converts to kinetic energy. c) Friction keeps the ball from moving. d) Gravity makes the ball float in the air. 21) The baseball has ______. a) potential energy b) kinetic energy 22) Which idea explains why the ball falls toward the Earth? a) It's magnetic.  b) Friction.  c) Gravity. d) Kinetic energy. 23) The car shows _____. a) motion b) gravity c) potential energy

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