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5th grade-science

speed a measure of how far something travels in a certain period of time.
kilometers per hour the number of kilometers something can travel in an hour
velocity a measure of speed in a certain direction
inertia the tendancy of an object to remain in motion unless an outside force causes a change
gravity a force that acts to pull pairs of objects together
mass the amount of matter in an object
weight the force gravity exerts on an objects mass
acceleration rate of change in speed or direction of movement
friction a force that resists the movement of one surface past another surface
air resistance friction caused by gas molecules in the air hitting an object and slowing it down
streamline to design smooth round objects so it slips through the air with the least possible resistance
Created by: 824309374