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11 terms

Forces & Motion

3rd grade science vocab for Forces & Motion
STUDY
PLAY
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)