Acceleration

The change in velocity divided by the time it takes for the change to occur.

On what does the acceleration of an object depend?

Mass and force.

Newton's Second Law of Motion

The net force accting on an object causes an object to accelerate in the direction of the net force.

A= net force

    mass

Kilogram

Unit of Mass.

(m/s2)

The unit of acceleration.

Force

Kg x m/s2

Newton

The unit kg x m/s2

Newton's Second Law

Used to calculate the net force on an object.

F= ma

Friction

The force that apposes motion between two surfaces that are touvhing each other.

Microwelds

The areas where the bumbs on two surfaces stick together causing friction.

Static Friction

The friction between two surfaces that are not moving past eacchother.

Sliding Fritction

The force that apposes two surfaces the motion of two  sliding past surfaces eachother.

Rolling Friction

The friction between a rolling object and the suface it rolls on.

Rolling friction is usually much less than static or sliding friction.

Air Resistance

Reacts on objects that fall through the air and depends on the speed, size, and shape of the object.

Terminal Velocity

The highest velocity that a falling object will reach.