Newton's third law of motion

1. Newton’s Third Law of
Motion
Newton’s Third law describes effects of action and reaction

2. Force
• Force- Push or a pull on
an object
– Object speeds up, slows
down, or turns from force
• More than one force can act
on an object at the same time
• Net Force- Combination
of all the forces acting on
an object.
• Force= Mass X Acceleration

3. Balanced and Unbalanced Forces
• Balanced Forces- Two or
more forces exerted on
an object that cancel
each other and do not
change object’s velocity
– Net force is zero
• Unbalanced Forces-
Effects of the forces don’t
cancel and the object’s
velocity changes
– Net force is not zero

4. Newton’s Third Law of Motion
• Isaac Newton (1642-1727)-
Explained motion of objects in 3
laws of motion
• Newton’s Third Law of Motion-
The third law of motion states
that for every action there is a
an equal and opposite
reaction that acts with the
same momentum and the
opposite velocity.

5. Newton’s Third Law of Motion
• The Third law of motion states that for every action, there is an equal
and opposite reaction.
• In other words: When an object exerts a force on a second object,
the second one exerts a force on the first that is equal and opposite
in direction.

6. Examples of Newton’s Third Law
• When you jump off a small rowing boat into water, you will push
yourself forward towards the water. The same force you used
to push forward will make the boat move backwards.
• When air rushes out of a balloon, the opposite reaction is that
the balloon flies up.
• When you dive off of a diving board, you push down on the
springboard. The board springs back and forces you into the
air.

7. Examples of Newton’s Third Law
• When you jump off a small rowing boat into water, you will push
yourself forward towards the water. The same force you used
to push forward will make the boat move backwards.
• When air rushes out of a balloon, the opposite reaction is that
the balloon flies up.
• When you dive off of a diving board, you push down on the
springboard. The board springs back and forces you into the
air.