Category 1
A push or a pull
Force
The force of attraction between two objects
Gravity
Amount of matter in a object
Mass
The moon's pull on ocean water
Tides
Metric system unit to measure force or weight
Newton
Metric system measure of mass
Kilogram
The measure of the pull of gravity on an object's mass
Weight
Equal forces acting in opposite directions
Balanced forces
All of the forces acting on an object
Net force
The object an observer uses to detect motion
Frame of reference
The position of one object compared to another
Relative motion
The direction and shortest distance traveled during a position change
Displacement
The total length of the path between two points
Distance
The speed at any given point
Instantaneous speed
A device that shows instantaneous speed
Speedometer
The distance an object moves in a certain period of time
Speed
The measure of the speed and direction of a moving object
Velocity
The change in velocity during a particular time period
Acceleration
Italian scientist who studied falling objects
Galileo
Ball bearings inside wheels reduce
Friction
The tendency of an object to resist any change in its state of motion
Inertia
English scientist who described how things move.
Newton
A satellite orbiting Earth moves in a ________ motion
Circular
The friction from air particles hitting a moving object
Air resistance
All objects resist changes in
Motion