Motion occurs when an object changes

position

Relative motion

—

motion that is not obvious

If sitting in desk, not moving relative to the desk

or school; but are moving relative to the other

planets & Sun

Unbalanced forces cause changes in motion

Relative to frame of reference

DISTANCE

How far something has

traveled

Scalar Quantity

—

described

by magnitude (numerical

value); 10m

Distance standard unit = m

DISPLACEMENT

Distance & direction of an

object’s change in position

from the starting point

Vector Quantity

—

both

magnitude & direction; 10

m, East

4m X 2m

Distance?

Displacement?

SPEED

How long it takes to go a

certain distance

Standard Unit

—

m/s

On a graph, slope is equal

to speed

Speed (velocity) =

distance / time

v=d/t

ACCELERATION

How long it takes to go

from being at 1 speed to

another

Standard Unit

—

m/s

2

Acceleration = final velocity

–

Initial Velocity/time

a =

v

f

–

v

i

/time

SPEED

Distance and object travels

per unit of time

Speed = distance/time

VELOCITY

Speed & direction of a

moving object

•

S = d/t or V= d/t

•

Standard Unit

–

m/s

•

Speed = distance/time

Product of an object’s mass & velocity

Momentum = Mass x Velocity or p = m x v

Standard units

–

kg x m/s

Mass & velocity together represent the force

needed to stop an object in motion

Force is needed to start & stop an object’s motion

Work is the transfer of energy when applied

force makes an object move in the direction

of the applied force

Formula

–

work = force x distance

Standard units

–

Work = joule (J)

Force = Newton (N)

Distance =

meter (m)

Power is the amount of work done in a certain

amount of time

Formula

–

Power = work/time or P = W/t

Standard units

–

Power = Watt (W)

Time = Second

An object will remain at rest, or continue to

move at a constant velocity (speed) unless a

net force acts on it

Net force on an object is equal to its mass

times its acceleration

For every force acting on an object, the

object will exert an equal, yet opposite, force

For every action there is an equal & opposite

reaction

—

ie

. rocket

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