Newton’s 3 Laws of Motion
Newton’s 1st Law of Motion
(Law of Inertia)
An object at rest or in motion will
stay at rest or in motion unless
acted upon by an unbalanced
force.
Newtons First Law
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Newton’s 2nd Law of Motion
Force = mass x acceleration
Acceleration is produced when
a force acts on a mass. The
greater the mass (of the object
being accelerated) the greater
the amount of force needed
(to accelerate the object).
• The second law shows that if you
exert the same force on two
objects of different mass, you will
get different accelerations
(changes in motion). The effect
(acceleration)
on
the
smaller
mass
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will be greater (more noticeable).
• Heavier objects require more force
Newton's Second Law to move the same distance as
lighter objects.
Marble's Lab
Force and acceleration are directly proportional
1. If force increases, acceleration increases
2. If force decreases, acceleration decreases
Mass and acceleration are inversely proportional
1. If mass increases, acceleration decreases
2. If mass decreases, acceleration increases
Two objects of different masses require
different amounts of force to accelerate at the
same rate.
Newton’s 3rd Law of Motion
Action-Reaction
For every action there is an equal
and opposite reaction.
This means that for every force
there is a reaction force that is
equal in size, but opposite in
direction. That is to say that
whenever an object pushes
another object it gets pushed
back in the opposite direction
equally hard.
Jet Pack Rocket Science
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Newton's 3rd Law