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Newton’s Laws of Motion
Newton’s laws of motion
• 1st Law – An object at rest will stay at rest,
and an object in motion will stay in motion
at constant velocity, unless acted upon by
an unbalanced force.
• 2nd Law – Force equals mass times
acceleration.
• 3rd Law – For every action there is an
equal and opposite reaction.
Newton’s First Law
Also known as the
Law of Inertia.
Inertia-the
resistance to
change in motion.
Think Pair Share
1. Take a minute and think of times
when you have experienced
Newton’s First Law
2. Pair up with someone and discuss
your experiences with Newton’s First
Law
3. Now we will share our examples as a
class
Newton’s Second Law
F=mxa
• The net force of an object is equal to the
product of its mass and acceleration, or F=ma.
• The units for force are Newtons (N).
• Mass is measured in kilograms (kg).
• Acceleration is m/s2.
• The acceleration constant for gravity is 9.8
m/s2.
Think Pair Share
What is the force on a 1000 kg elevator that is
falling freely at 9.8 m/sec/sec?
Newton’s Third Law
For every action, there is an equal and
opposite reaction.
Newton’s Third Law
• According to Newton, whenever objects A and
B interact with each other, they exert forces
upon each other. When you sit in your chair,
your body exerts a downward force on the
chair and the chair exerts an upward force on
your body.
Think Pair Share
1. Take a minute and think of times when you
have experienced Newton’s third law
2. Pair up with someone and discuss your
experiences with Newton’s third law
3. Now we will share our examples as a class