magnitude only. Like mass, time, temperature

magnitude and direction. Like velocity, force, acceleration.

ax = a cos o ay, = a sin o

Derived Quantities

does not change the size of the physical quantity but just change the name of its unit

Basic Quantities

exactly equal 1

f x d/t

is the rate of work done.

g=¿¿

PE = mx 9 xh

is the stored energy in an object of mass m and at height h above earth surface.

KE = ½ mv (Joule)

is the energy possesses by a moving object of mass m and speed v.

Work = force x displacement x0

Work, =- (force x displacement)

in opposite direction

Work = force x distance

are in the same direction

Work = force x displacement × cos

is the energy spent to move an object a distance by applying force

Fg is the force that the earth exerts on an object.

unbalanced

For every action there is an equal and opposite reaction

balanced

"A net force acts on an object produces an acceleration (a change of motion of the object)"

Classes of Forces

is the tendency of an object to resist changes in its state of motion",

An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force"

is an action that can change motion.