This document summarizes Newton's three laws of motion. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force. The greater an object's mass, the greater its inertia and the force needed to overcome it. Newton's second law states that force equals mass times acceleration (F=ma). The greater the force or mass, the greater the acceleration. Newton's third law states that for every action force there is an equal and opposite reaction force. Forces always occur in pairs.

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Newton's Laws of MotionNewton's Laws of Motion

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Newton’s First Law
An object at rest tends to stay at rest and
an object in motion tends to stay in
motion with the same speed and in the
same direction unless acted upon by an
unbalanced force.
Also called the law of inertia
The greater an object’s mass, the greaterThe greater an object’s mass, the greater
its inertia, and the larger the force neededits inertia, and the larger the force needed
to overcome the inertia.to overcome the inertia.
Newton’s 1st
law

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•car suddenly stops and you strain against the
seat belt because our bodies want to keep
moving
• the difficulty of pushing a dead car
• car turns left and you appear to slide to the
right
• ketchup stays in the bottom (at rest) until you
bang (outside force) on the end of the bottom
• a headrest in a car prevents whiplash injuries
during a rear-end collision (your head goes
forward and then jerks backward)
Examples of Newton’s
1st
Law
Examples of 1st
law

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Newton’s 2nd
Law
F = M x A
The greater the force, the greater the
acceleration
The greater the mass, the greater the
force needed for the same acceleration
Calculated by: F = ma
(F = force, m = mass, a = acceleration)
Newton’s 2nd
Law

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Examples of Newton’s
2nd
Law
•hitting a baseball, the harder the hit, the faster
the ball goes
• accelerating or decelerating a car
•The positioning of football players –
massive players on the line with lighter
(faster to accelerate) players in the
backfield
• a loaded truck versus an unloaded truck
Examples of 2nd
Law

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Newton’s 3rd
Law
For every action force, there is an equal and
opposite reaction force. (Forces are always
found in pairs.)
Athlete pushes bar upwards.
Bar pushes the athlete downwards.
Bowling ball pushes pin to the right.
Pin pushes bowling ball to the left.
Newton’s 3rd
Law

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Examples 3rd
Law
•Momentum of the car moving forward and the
car comes to a sudden stop, our body pushes
against the seat (action) belt and the seat belt
pushes back (reaction).
•When you lean on the wall to rest, the weight
on the wall provides the reaction force and the
wall pushes back on you (reaction force) with
the same force.
• Roller coaster ride- The train to the tracks.
•Birds wings to the air.
Examples of 3rd
Law