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14 Cards in this Set
- Front
- Back
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rate of motion calculated by dividing the distance traveled by the amount of time it takes to travel that distance
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average speed
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speed of an object at any given time
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instantaneous speed
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speed of an object and its direction of motion; changes when speed changes, direction of motion changes, or both
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velocity
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change in velocity divided by the amount of time needed for the change to occur; takes place when an object speeds up, slows down, or changes direction
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acceleration
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a push or a pull; SI unit is the newton
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force
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force that resists motion between two touching surfaces and always acts opposite to the direction of motion
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friction
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tendency to resist a change in motion
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inertia
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done when an applied force causes an object to move in the direction of the force
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work
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device that makes work easier with only one movement; can change the size or direction of a force, and includes the wedge, screw, lever, wheel and axle, pulley, and inclined plane
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simple machine
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a combination of simple machines
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compound machine
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number of times a machine multiplies the effort force you apply to it
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mechanical advantage
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an object with a groove, like a wheel, with a rope or chain running through the groove
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pulley
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a rod or plank that pivots around a fixed point
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lever
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a sloped surface
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inclined plane
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