Newton’s Third Law of
Motion
Action and Reaction
Action and Reaction
According to Newton’s third law
of motion, forces always act in
equal but opposite pairs.
Action and Reaction
According to Newton’s third law
of motion, forces always act in
equal but opposite pairs.
For every action, there is an
equal but opposite reaction.
Action and Reaction
According to Newton’s third law
of motion, forces always act in
equal but opposite pairs.
For every action, there is an
equal but opposite reaction.
When one object exerts a force on
another object, the second object
exerts the same size force on the
first object.
Action & Reaction Forces Don’t Cancel
Action & Reaction Forces Don’t Cancel
The force exerted by two objects on each other are called an
action-reaction force.
Action & Reaction Forces Don’t Cancel
The force exerted by two objects on each other are called an
action-reaction force.
Action and reaction force pairs don’t cancel because they act
on different objects. Forces can cancel only if they act on the
same object.
Large and Small Objects
Large and Small Objects
When the mass of
one object is
considerably larger
than the mass of
another object, the
action-reaction forces
is not noticeable.
A Rocket Launch
A Rocket Launch
Newton’s Third Law enables a
rocket to fly.
A Rocket Launch
Newton’s Third Law enables a
rocket to fly.
The rocket pushes the gas
molecules downward,
which is the action force.
A Rocket Launch
Newton’s Third Law enables a
rocket to fly.
The rocket pushes the gas
molecules downward,
which is the action force.
The reaction force is the
upward push on the
rocket engine by the gas
molecules.