Law One  Law of Inertia

Inertia- resistance to change motion (whether it is has no motion or is moving)

- an object will remain at rest or moving at a constant velocity (speed in a certain direction) unless it is acted upon by an unbalanced force.

- inertia depends on mass.  More mass the more inertia.  Less mass the lower inertia.

        a book is sitting on the table.  It will continue to be motionless unless you pick it up.  You provide the unbalanced force.  The book will begin to move.
 
        a pitcher will throw the  ball over the home plate.  The batter will hit the ball changing the direction of the ball.  If the batter misses the ball, the ball will continue in the same direction that is was thrown.

Law Two -  F=ma  also stated as    a= F/m

-acceleration depends on the net force acting on the object and on the object's mass

 
                        acceleration  =   Force /  mass

        The greater the force the greater the acceleration
        The greater the mass the lesser the acceleration

        A speed boat pulls a water skier.  The skier will accelerate.  If the speed boat uses the same force and tries to pull two water skier, the acceleration will not be as great.
 
 

Law Three-  Equal and Opposite

 - if one object exerts a force on another object, then the second object exerts a fore of equal strength in the opposite direction on the first object

         A volleyball player exerts an upward action force on the ball.  In return, the ball exerts an equal but opposite downward reaction force back on her wrists.
 

The action and reaction forces act on different objects making it different from unbalances forces.
 
 
momentum= quantity of motion
 
- momentum = mass X velocity