# Linear Motion POP I

Vocabulary Terms for Newton's Laws of motion and basic mechanics

## Terms

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Mass
The amount of matter an object contains.
Displacement
The distance from a reference point.
Newton's First Law of Motion
An object in motion will stay in motion and an object at rest will stay at rest until acted upon by an unbalanced force.
Force
A push or pull which acts on an object.
Speed
The change in distance over a period of time.
Newton's Third Law of Motion
For every force there is an equal and opposite force.
Acceleration
The change in an objects velocity over a period of time.
Scalar
A quantity which is only has a magnitude.
Vector
A quantity with both a magnitude and a direction.
Velocity
The change in displacement over a period of time.
Distance
The length, height or width of an object or between objects.
g
The acceleration due to gravity on Earth (9.8m/s²)
Newton's Second Law of Motion
The net force acting on an object is equal to the product of the objects mass and acceleration.
Weight
The gravitational force exerted on an object.
Terminal Velocity
The speed at which air resistance (drag) on a falling object equals the force of gravity on the object.

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