(v=d/t)

v = speed (velocity

d = distance

t = time

Then, graph your results for easier visualization:

time = x axis = independent variable

distance = y axis = dependent variable

What if you know speed, but don't know time, or don't know distance?

A handy little circle formula:

v = d/t

d = v x t

t = d/v

Velocity and Acceleration

Velocity =  speed AND direction

Acceleration =

• Rate of change of velocity

We shorten it as:

and we use "delta" to indicate change

And another version of that handy little circle formula, this time for acceleration:
 

• answers will look something like:

m/s/s - "meters per second per second"

or

m/s² - "meters per second squared"

Motion/Forces

• a push or a pull on an object.

• feel the force of the floor on your feet.

• often the effect is a change in velocity called......?

- (acceleration)

• forces equal in size and opposite in direction, like the force the floor exerts on your feet.

• if not balanced, you must be moving and this is called:

Net force

• when velocity is always changed

INERTIA

• tendency of an object to resist a change in motion.
• greater mass has greater inertia

Newton's First Law of Motion

• an object that has constant velocity will continue moving at that unchanged velocity unless acted on by a net force

• this is true whether the object has motion or not

Friction

• the force opposing motion when 2 objects touch one another

Gravity

• a force exerted between every object and every other object

• directly proportional to mass

- greater mass exerts greater gravity
- lesser mass exerts less gravity

• indirectly proportional to distance

between objects
- greater distance lessens the pull of gravity

• measure of the force of gravity on an object

• not the same as mass, but directly related - the more mass-the greater the weight

• the Newton is the metric measure

• 4.45 Newtons = 1 pound = .45 kg

• 1 kg = 9.8 N

Updated 02/25/08 10:01