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the state in which one objects distance from another is changing.

reference point

a place of object used for comparison to determine if something is in motion


the distance an object travels per unit of time


a speed in any direction


the rate in which the the velocity changes


push or pull on an object

balanced force

equal force acting on a object in different directions.

unbalanced force

forces that produce a nonzero net force

net force

the overall force an an object


the force between two rubbing surfaces


the force that pulls objects towards each other

free fall

when the only force acting on an object is gravity

terminal velocity

the maximum speed possible while free falling

inertia : Newton's first law of motion

an object in motion stays in motion

Newton's second law of motion

The acceleration of an object depends on the mass of the object and the amount of force applied


the product of a body's mass and its velocity

Newton's Third law

for every action there is an equal and opposite reaction

Centripetal Force

a force that causes an object to move in a cycle


(physics) the capacity of a physical system to do work

kinetic energy

the mechanical energy that a body has by virtue of its motion

potential energy

the mechanical energy that a body has by virtue of its position

Law of Conservation of energy

the law that states that energy cannot be created or destroyed but can be changed from one form to another

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