Chapter 2 1-4 Science test

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A push or a pull.

static, sliding, rolling, and fluid

4 types of friction?

opposes motion

How does friction affect motion?


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


The product of an object's mass and velocity.

Mass times velocity

Formula of momentum?

amount of mass and speed

What does momentum depend on?


amount of matter in an object

Net force divided by mass

Formula of acceleration

balanced forces

Equal forces acting on an object in opposite directions, no change in motion.

unbalanced forces

Forces that produce a non-zero net force, which changes motion.

Newton's first law

An object at rest remains at rest, an object in motion remains in motion, unless acted upon by an outside force. (also called law of inertia)

Newton's second law

Acceleration depends on net force and mass.

Newton's third law

For every action there is a equal and opposite reaction.

centripetal force

a force that keeps an object moving in an circle.


Any object that travels around another object in space.


the SI unit of force


every newton is measured to be the same as a...

terminal velocity

when a falling object reaches this when forces of gravity and air resistance are balanced.


the force that pulls and accelerates objects toward the Earth.


if forces act together we do what to the net force?

subtract the smaller one from the larger one

if forces act against each other what do we do to the net force?

no motion

if forces are equal and opposite to each other what happens to the object?


________ is the gravitational force exerted on an object.

one newton

____ ________ equal the force required to accelerate 1 kilogram of mass at 1 meter per second ²

free fall

when only gravity is acting upon a falling object.

air resistence

the kind of friction that slows a falling object


the general term for the force that one surface exerts on another when they rub against each other

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