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the force of attraction between objects due to their masses.


force that opposes motion between two

Free Fall

When the only force acting on an object is gravity

Terminal Velocity

the greatest speed reached by falling objects


push or pull


basic unit of force in the SI system

Unbalanced Forces

forces that cause a change in motion

Balanced Forces

forces that cause no change in motion

Acceleration due to Gravity on Earth

9.8 m/s/s

Air Resistance

a form of fluid friction


objects that are thrown


measurement of the amount of gravity acting on an object


amount of matter in an object

Kinetic Friction

friction between moving objects

Static Friction

friction between non-moving objects

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