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3rd grade science vocab for Forces & Motion


push or pull


change in position


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


the force that pulls objects together


the measure of the pull of gravity on an object

simple machine

a tool that helps people do work, makes work easier


something done when a force moves an object a distance


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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