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### 19 Cards in this Set

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 Force A push or a pull Gravity The force that pulls everything towards the center of Earth. Newton Inventor of the reflecting telescope. Speed A measure of how far something moves during a period of time. Average Speed The measure of the total distance an object was moved divided by the total time elapsed. Velocity The speed of an object in a particular direction. Friction A force that opposes motion whenever two surfaces rub together against each other. Balanced forces The opposite forces acting on an object that cancel each other out. Unbalanced forces The forces acting on an object that cause a change in velocity, making an object speed up, slow down or change direction. The strength of the gravitational force between objects does not depend on their size. It depends only on the _____ of the objects and the distance between them. Mass Weight is a measure of _____. Gravity What makes moving objects stay in motion? Inertia What makes moving objects stop? A push or a pull When we walk on the ground, our feet push against the ground. At the same time, the ground pushes against our feet with _____ force. Equal Mass is a measure of _____. the amount of matter that makes up an object For every action force there is a reaction force of _____ strenght that acts in the _____ direction. Equal Opposite Give an example of a balanced force. Two kids (each weighing the same) on a teeter totter. Give an example of a unbalanced force. You and Amanda on a teeter totter. Why can you walk up a 1 mile hill in 60 minutes but it only takes 30 minutes to walk down the same hill? Gravity.