Initial Velocity

V_f

m/s, km/h

m/s²,

km/h/s

m, km

Acceleration due to gravity

(9.8m/s² on

the Earth's surface)

km/h/s

hr

The rate of change of position or, the change in position over time.

(Can be either positive or negative, or specified as a direction)

The rate of change in velocity or, the change in velocity over time.

(Is positive if the velocity change is also positive)

NOTE: - The term km/h² is rarely / never used because it's not practical

- Negative acceleration (slowing down) is opposite the direction of the force of the moving

object, because in order to "cancel out" the velocity of the object, another force must hit that

object in the opposite direction. (see car diagram below)

<-- force moving (positive acceleration) - travelling west

--> force braking (negative acceleration caused by friction) - travelling east

The natural force of attraction between any two massive bodies.

The natural force of attraction by an object and a celestial body, which tends to pull the object closer to the body.

NOTE: Gravitation is explained by Einstein's general relativity, or by Newton's law of universal gravitation.

The strength of a gravitational field or, the acceleration of objects under the gravitational field’s influence.

NOTE: - Acceleration on Earth's surface due to gravity is approximately 9.8m/s².

- If the initial direction is upward, gravity's acceleration is -9.8m/s² because

of its downward nature

- If the initial direction is downward, gravity's acceleration becomes positive (+9.8m/s²)