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# Force and Motion

### Force and Motion Vocabulary

TermDefinition
Reference point a place that tells where you are; used to compare motion
Distance the amount of space between two points
Displacement the distance between the final and starting position
Speed describes how fast something is moving (s= d/t)
Velocity the speed of an object in a particular direction
Acceleration the change in velocity divided by the time it takes to occur
Force is a push or a pull
Inertia measures an object’s tendency to resist changing its motion
Balanced Forces forces that cancel each other out. If the forces acting on something are balanced its motion does not change.
Unbalanced Forces cause motion and change
Friction force that resists motion between two touching surfaces
Gravity the pull that all matter exerts on other matter
Weight the force of gravity on an object on the planet or moon where the object is
Mass the amount of matter in an object