How fast an object is moving.
Rate of change in displacement.
Speed in a certain direction.
A mathematical quantity with a value, units, and a direction.
An observation that is recorded in numbers that describes a quantity and answers the question "how many?"
A stationary point against which the position of another object is measured.
An observation that is recorded in words that describes a quantity.
The force of the pull of gravity on an object.
The force exerted by two surfaces moving past each other.
A push or pull.
When forces are balanced
Total length of the path traveled between starting point and the ending point.