I didn't know any other tag other than SAT so I clicked it bu is it not SAT
force
a push or a pull on an object and is a vector (N)
exert
to apply a force
noncontact force (force field)
a force that one object can apply on another object without touching
gravity
an attractive force that exists between all objects that have mass
mass
the atom count of an object (kg)
the law of universal gravitation
every object is attracted to each other by a gravitational force
Weight
the force of gravity on an object (N)
gravitational force and mass
When the mass of one or both objects increases, the gravitational force between them also increases.
gravitational force and distance
Gravitational force decreases as the distance between them increases.
relationship between weight and mass
An object's weight is proportional to its mass
Friction
a force that resists the motion of two surfaces that are touching
static friction
prevents two surfaces from sliding past each other
sliding friction
opposes the motion of things that are already sliding past each other
fluid friction
Friction between a surface and a fluid, such as air or water
Cause of friction
microscopic dips and bumps that slows sliding
lubricant
A substance that reduces friction
net force
The sum of all forces acting on an object
balenced forces
forces acting on an object that combine and form a net force of zero
unbalanced forces
forces acting on an object that combine and form a net force that is not zero
Newton's First Law
An object will keep doing what it's already doing unless an unbalanced force makes it do something else.
terminal velocity
the constant velocity reached when air resistance equals the force of gravity on a falling object
inertia
The tendency of an object to resist a change in motion
Newton's second law
Force and acceleration are directly related. Mass and acceleration are indirectly related.
centripetal force
a force that acts perpendicular to the direction of motion, toward the center of the curve
Newton's third law
for every action force, there is always an equal and opposite reaction force
force pair
the forces two objects apply to each other
momentum
a measure of how hard it is to stop a moving object and is a vector
law of conservation of momentum
the total momentum of a group of objects stays the same unless outside forces act on the objects
elastic collision
Two objects bounce off each other.
inelastic collision
two objects collide and stick together