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Describes how far an object moves during a certain
amount of time (p. 408)


The speed and direction of an object's motion (p. 409)


A push or pull that acts on an object (p. 410)


A force that pushes and pulls on other objects (p. 412)


An object is electrically charged when it gains or loses


A contact force that resists the movement of one surface
past another surface (p. 414)


Energy used when a force moves an object (p. 416)


The rate at which work is done (p. 417)


The state in which the net force is zero (p. 419)

Newton's First
Law of Motion

An object at rest will stay at rest until another object
acts upon it, and an object moving in a straight line at a
constant speed will continue to move in a straight line at a
constant speed until a net force acts upon it (inertia)


The tendency of an object to resist a change in motion (p.

Newton's Second
Law of Motion

Describes the relationship between acceleration (the rate
at which an object's velocity changes over time), mass, and
net force


The rate at which the velocity of an object changes over
time (p. 422)

Newton's Third
Law of Motion

Every force has an equal and opposite reaction, and they
always occur in pairs


A device that changes the direction or the amount of
effort needed to do work (p. 426)

Simple Machine

Machines that only have a few parts - they make it easier
to do work


A kind of simple machine consisting of a rope that fits
onto a wheel and used to change the direction of a force
(p. 426)

Wheel and Axle

A simple machine consisting of a wheel that revolves
around a post, or axis (p. 427)


A type of simple machine consisting of a bar that turns on
a support called a fulcrum (p. 428)

Inclined Plane

A form of simple machine consisting of a slanted surface
along which objects are easier to push upward than to lift
straight up (p. 429)

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