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14 Cards in this Set

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change in velocity divided by the amount of time needed for the change to occur.
acceleration
rate of motion calculated by dividing the distance traveled by the amount of time it takes to travel that distance
average speed
speed of an object at any given time.
instantaneous speed
speed of an object and its direction of motion
velocity
a push or a pull
force
force that resists motion between two touching surfaces and always acts opposite to the direction of motion
friction
tendency to resist a change in motion
inertia
a combination of simple machines.
compound machine
a sloped surface
inclined plane
a rod or plank that pivots about a fixed point.
lever
number of times a machine multiplies the effort force you apply to it.
mechanical advantage
an object with a groove, like a wheel, with a rope or chain running through the groove.
pulley
device that makes work easier with only one movement
simple machine
done when an applied force causes an object to move in the direction of the force.
work