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19 Cards in this Set
- Front
- Back
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Force
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A push or a pull
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Gravity
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The force that pulls everything towards the center of Earth.
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Newton
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Inventor of the reflecting telescope.
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Speed
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A measure of how far something moves during a period of time.
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Average Speed
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The measure of the total distance an object was moved divided by the total time elapsed.
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Velocity
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The speed of an object in a particular direction.
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Friction
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A force that opposes motion whenever two surfaces rub together against each other.
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Balanced forces
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The opposite forces acting on an object that cancel each other out.
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Unbalanced forces
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The forces acting on an object that cause a change in velocity, making an object speed up, slow down or change direction.
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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.
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Mass
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Weight is a measure of _____.
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Gravity
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What makes moving objects stay in motion?
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Inertia
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What makes moving objects stop?
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A push or a pull
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When we walk on the ground, our feet push against the ground. At the same time, the ground pushes against our feet with _____ force.
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Equal
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Mass is a measure of _____.
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the amount of matter that makes up an object
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For every action force there is a reaction force of _____ strenght that acts in the _____ direction.
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Equal Opposite
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Give an example of a balanced force.
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Two kids (each weighing the same) on a teeter totter.
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Give an example of a unbalanced force.
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You and Amanda on a teeter totter.
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Why can you walk up a 1 mile hill in 60 minutes but it only takes 30 minutes to walk down the same hill?
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Gravity.
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