A push or a pull.
static, sliding, rolling, and fluid
4 types of friction?
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
Equal forces acting on an object in opposite directions, no change in motion.
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.
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...
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?
if forces are equal and opposite to each other what happens to the object?
________ is the gravitational force exerted on an object.
____ ________ equal the force required to accelerate 1 kilogram of mass at 1 meter per second ²
when only gravity is acting upon a falling object.
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