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NIKHILA K. NAIR
PHYSICAL SCIENCE
FATIMA MEMORIAL TRAINING COLLEGE
PALLIMUKKU
• The forces exerted by two objects on
each other are often called an action-
reaction force pair.
• Either force can be considered the
action force or the reaction force.
• Action and reaction force pairs don’t
cancel because they act on different
objects.
Newton’s Third Law of Motion
states: For every action,
there is an equal and
opposite reaction.
The reaction of a rocket is an
application of the third law
of motion. Various fuels are
burned in the engine,
producing hot gases.
The hot gases push against
the inside tube of the rocket
and escape out the bottom of
the tube. As the gases move
downward, the rocket moves
in the opposite direction.
Consider the
motion of a car on
the way to school. A
car is equipped with
wheels which spin
backwards. As the
wheels spin
backwards, they
grip the road and
push the road
backwards.
The baseball
forces the bat to
the left (an
action); the bat
forces the ball to
the right (the
reaction).
Flying gracefully
through the air, birds
depend on Newton’s
third law of motion. As
the birds push down on
the air with their wings,
the air pushes their
wings up and gives them
lift.
• Consider the flying motion of birds. A bird flies by
use of its wings. The wings of a bird push air downwards.
In turn, the air reacts by pushing the bird upwards.
• The size of the force on the air equals the size of the force
on the bird; the direction of the force on the air
(downwards) is opposite the direction of the force on the
bird (upwards).
• Action-reaction force pairs make it possible for birds to
fly.
 Consider the propulsion
of a fish through the
water. A fish uses its fins
to push water backwards.
In turn, the water reacts
by pushing the fish
forwards, propelling the
fish through the water.
 The size of the force on
the water equals the size
of the force on the fish;
the direction of the force
on the water (backwards)
is opposite the direction
of the force on the fish
(forwards).
Hammer on the nail
Newton''s third law of motion

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Newton''s third law of motion

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  • 2. Submitted by NIKHILA K. NAIR PHYSICAL SCIENCE FATIMA MEMORIAL TRAINING COLLEGE PALLIMUKKU
  • 3. • The forces exerted by two objects on each other are often called an action- reaction force pair. • Either force can be considered the action force or the reaction force. • Action and reaction force pairs don’t cancel because they act on different objects.
  • 4. Newton’s Third Law of Motion states: For every action, there is an equal and opposite reaction.
  • 5. The reaction of a rocket is an application of the third law of motion. Various fuels are burned in the engine, producing hot gases. The hot gases push against the inside tube of the rocket and escape out the bottom of the tube. As the gases move downward, the rocket moves in the opposite direction.
  • 6. Consider the motion of a car on the way to school. A car is equipped with wheels which spin backwards. As the wheels spin backwards, they grip the road and push the road backwards.
  • 7. The baseball forces the bat to the left (an action); the bat forces the ball to the right (the reaction).
  • 8. Flying gracefully through the air, birds depend on Newton’s third law of motion. As the birds push down on the air with their wings, the air pushes their wings up and gives them lift.
  • 9. • Consider the flying motion of birds. A bird flies by use of its wings. The wings of a bird push air downwards. In turn, the air reacts by pushing the bird upwards. • The size of the force on the air equals the size of the force on the bird; the direction of the force on the air (downwards) is opposite the direction of the force on the bird (upwards). • Action-reaction force pairs make it possible for birds to fly.
  • 10.  Consider the propulsion of a fish through the water. A fish uses its fins to push water backwards. In turn, the water reacts by pushing the fish forwards, propelling the fish through the water.  The size of the force on the water equals the size of the force on the fish; the direction of the force on the water (backwards) is opposite the direction of the force on the fish (forwards).
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