acceleration

the rate at which velocity changes with time

Average speed

the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time

Balanced force

equal forces acting on an object in opposite directions

displacement

distance and direction of an object's change in position from the starting point

distance

the property created by the space between two objects or points

force

a push or pull on an object

inertia

(physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force

instantaneous speed

the rate of motion at a given instant in time, such as that given on a car's speedometer

net force

the combination of all forces acting on an object

speed

distance travelled per unit time

velocity

the speed of an object in a particular direction

air resistance

frictional force air exerts on a moving object; acts opposite in direction to the object's motion

centripetal acceleration

the acceleration toward the center that holds a satellite in elliptical orbit

centripetal force

the inward force on a body moving in a curved path around another body, the force that causes an object moving along a circular path to move toward the center of the path

friction

the force that opposes the motion of one surface as it moves across another surface

momentum

the product of a body's mass and its velocity

Newtons 2nd law of motion

the net force of an object equals its mass times its acceleration

Newtons 3rd law of motion

a principle that states that for every action there is an equal reaction in the opposite direction

sliding friction

friction that occurs when one solid surface slides over another

static friction

friction that acts on objects that are not moving

weight

the vertical force exerted by a mass as a result of gravity

Newtons 1st law of motion

An object at rest/motion will remain at rest/motion until acted upon by an outside force