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The amount of matter an object has; a measure of an object's inertia; measured in g or kg
Mass

Is the distance it travels divided by time it takes
Speed

Is speed with direction over rate of motion and the direction
Velocity

Is a push or pull, or any action that has the ability to change motion
Force

Property of an object that resists change in its motion
Inertia

The rate of change in velocity; rate at which your speed increases
Acceleration

It is accelerating due to the force of gravity and no other forces are acting on it
Free fall

The speed at a pacific time
Instantaneous speed

The maximum speed reached by an object in free fall, the speed at which the forces of gravity and air resistance are equal
Terminal speed

Whenever one object exerts a force on another, the second object exerts an equal and opposite force on the first
Newton's third law

A speed that does not change
Constant speed

The action of moving or of changing place or position
Motion

The force of attraction on an object on another
Gravity

The total distance traveled divided by the total time elapsed
Average speed

Two equal forces are applied on an object pushing both ways
Balanced force

Forces that produce a non zero net force, which changes an object's motion
Unbalanced force

