1) The velocity of an object changing over time a) acceleration b) speed c) gravity d) friction 2) charging a phone. a) energy b) friction c) velocity d) potential energy 3) what is the definition of gravity a) a force that make things move b) a force that pulls things towards the earth c) a force thats makes things slow down when they rub against eachother  4) Lifting a weight. a) work b) gravity c) energy d) speed 5) 6000 kilograms. a) mass b) potenial energy c) speed d) power

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