20 terms

# Unit 3: Forces and Motion and Newton's Laws

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Motion
An object's change in position relative to a reference point.
Reference Point
A location or object that you can use to determine if an object is moving.
Displacement
The change in position of an object.
Speed
A measure of how far an object moves in a certain amount of time
Velocity
Speed in a given direction
Vector
A quantity that has both size and direction.
Acceleration
Change in velocity (ANY change in speed or direction)
Force
A push or a pull
Newton
The SI unit for force
Net Force
The combination of all forces acting on an object
Balanced Force
forces acting on an object that combine and form a net force of zero; cause no change in motion
Unbalanced Force
Forces that combine to produce a net force that is not equal to zero and cause the a change in speed and/or direction.
Newton's Laws of Motion
A set of laws the describes the relationship between force, matter and motion
Inertia
Resistance of an object to a change in its motion
Friction
A force that opposes motion between two surfaces that are in contact
Normal Force
The force that a surface exerts on an object that is pressing on it
Mass
The amount of matter in an object
Gravity
The attractive force between any two things that have mass
Weight
the force of gravity on an object
Applied Force
forces that involve direct contact