Forces and Motion

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Forces and Motion Vocabulary Review

Force

is a push or a pull

Newton (N)

the unit for force

Balanced Forces

equal but opposite; occurs when the net forces on an object equals "zero" and the objects motion does NOT change

Unbalanced Forces

when the net forces on an object does NOT equal "zero" and the objects motion does change

Gravity

force of attraction between 2 objects; determined by the mass of the objects and the distance between them

Weight

a measure of the force of gravity on an object's mass

Mass

is the amount of matter or stuff in an object

Friction

a force that acts in the opposite direction of motion

Air Resistance

a fluid frictional force on falling objects that opposes gravity

Speed

the rate in which an object moves: calculated by distance / time

Acceleration

the change in velocity over a period of time

Frame of Reference

used to determine if an object is in motion; the background object that you assume is stationary in order to compare it to an moving object

Newton's 1st Law of Motion

an object at rest will stay at rest and an object in motion will stay in motion until an outside force acts upon it

Newton's 2nd Law of Motion

explains the relationship between acceleration, mass and force; Force=Mass x Acceleration

Newton's 3rd Law of Motion

for every action there is an equal and opposite reaction

Motion

caused by unbalanced forces acting on an object

Velocity

speed in a certain direction

Electric

force caused by non-moving charges

Magnetic

force caused by moving charges

Centripetal

it causes objects to travel in a circular path

Applied

a force exerted on an object by a person or another object

Normal

the support force exerted upon an object that is in contact with another stable object

Tension

force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends

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