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3rd grade science vocab for Forces & Motion

force

push or pull

motion

change in position

friction

force caused by objects rubbing together that makes objects slow down or stop

gravity

the force that pulls objects together

weight

the measure of the pull of gravity on an object

simple machine

a tool that helps people do work, makes work easier

work

something done when a force moves an object a distance

speed

how fast something moves over a certain distance

Newton's 1st Law of Motion

An object at rest, stays at rest until a force acts upon it. An object in motion, stays in motion until a force acts upon it. (book on your desk at night)

Newton's 2nd Law of Motion

Acceleration of an object depends on the force acting on the object & the mass of the object. (football and balloon)

Newton's 3rd Law of Motion

For every action there is an equal and opposite reaction. (balloon, rocket)

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