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LAW OF MOTIONLAW OF MOTION
Who figured out mostWho figured out most
of what we knowof what we know
aboutabout
how things movehow things move??
“If I have ever made any valuable discoveries, it
has been owing more to patient attention,
than to any other talent”
Isaac Newton
What is the law of motion?
• Newton's laws of motionNewton's laws of motion are
three physical laws which provide
relationships between the forcesforces
acting on a body and the motionmotion
of the body.
Newton’s first law
An object at rest tends to stay at rest and
object in motion tends to stay in motion
unless acted upon by an unbalanced
force.
What does this mean?!
Basically, an object will keep doing what it
was doing, unless acted on by an
unbalanced force.
If the object was sitting still, it will remain
stationary. If it was moving at a constant
velocity, it will keep moving.
It takes force to change the motion of an
object.
What is meant by
unbalanced force?
If the forces on an object are equal and
opposite, they are said to be balanced,
and the object experiences no change in
motion. If they are not equal and
opposite, then the forces are unbalanced
and the motion of the object changes.
These are some examples from
real life
A soccer ball is sitting at rest.
It takes an unbalanced force of
a kick to change its motion.
Newton’s First Law is also
called the Law of Inertia
Inertia: the tendency of an object to
resist changes in its state of motion
Inertia: the tendency of an object to resist changes in its state of motion
The First Law states that all objects
have inertia. The more mass an object
has, the more inertia it has (and the
harder it is to change its motion).
More Examples from Real LifeMore Examples from Real Life
A powerful locomotive begins to pull a long line of
boxcars that were sitting at rest. Since the boxcars are
so massive,
they have a great deal of inertia and it takes a large
force to change their motion. Once they are moving, it
takes a large force to stop them.
If objects in motion tend toIf objects in motion tend to
stay in motion, why donstay in motion, why don’’tt
moving objects keep movingmoving objects keep moving
forever?forever?
Things don’t keep moving forever because
there’s almost always an unbalanced force
acting upon it.
A book sliding across a table slows down
and stops because of the force of friction.
If you throw a ball upwards it will eventually slow down and fall because of the force of
gravity.
If you throw a ball upwards it will
eventually slow down and fall because of
the force of gravity.
NewtonNewton’’s Second Laws Second Law
Force equals mass
times acceleration.
F = ma
AccelerationAcceleration: a measurement of how quickly
an object is changing speed.
Acceleration: a measurement of how quickly an object is changing speed
What doesWhat does F = maF = ma meanmean??
Force is directly proportional to mass
and acceleration. Imagine a ball of a
certain mass moving at a certain
acceleration. This ball has a certain
force.
Now imagine we make the ball twice as big
(double the mass) but keep the acceleration
constant. F = ma says that this new ball has
twice the force of the old ball.
Now imagine the original ball moving at
twice the original acceleration. F = ma
says that the ball will again have twice the
force of the ball at the original
acceleration.
More aboutMore about F = maF = ma
If you double the mass, you double the force. If you
double the acceleration, you double the force.
What if you double the mass and the acceleration?
(2m)(2a) = 4F
Doubling the mass and the acceleration quadruples
the force.
So . . . what if you decrease the mass by half? How
much force would the object have now?
What doesWhat does F = maF = ma saysay??
F = maF = ma basically means that the force of an
object comes from its mass and its
acceleration.
Something very massive (high mass) that’s changing
speed very slowly (low acceleration), like a glacier, can
still have great force.
Something very small (low mass) that’s
changing speed very quickly (high
acceleration), like a bullet, can still have a
great force. Something very small
changing speed very slowly will have a
very weak force.
NewtonNewton’’s Third Laws Third Law
For every action there
is an equal and
opposite reaction
For every action there is an
equal and opposite reaction
What does this meanWhat does this mean??
For every force acting on an object, there is an equal force
acting in the opposite direction. Right now, gravity is
pulling you down in your seat, but Newton’s Third Law
says your seat is pushing up against you with equal
force. This is why you are not moving. There is a
balanced force acting on you– gravity pulling down, your
seat pushing up.
Think about it. . .
What happens if you are standing on a
skateboard or a slippery floor and push
against a wall? You slide in the opposite
direction (away from the wall), because
you pushed on the wall but the wall
pushed back on you with equal and
opposite force.
Why does it hurt so much when you stub your toe?
When your toe exerts a force on a rock, the rock
exerts an equal force back on your toe. The
harder you hit your toe against it, the more force
the rock exerts back on your toe (and the more
your toe hurts).
ReviewReview
Newton’s First Law:
Objects in motion tend to stay in motion and objects at
rest tend to stay at rest unless acted upon by an unbalanced force.
Newton’s Second Law:
Force equals mass times acceleration (F = ma).
Newton’s Third Law:
For every action there is an equal and opposite
reaction.
Done by:

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Law of motion

  • 1. LAW OF MOTIONLAW OF MOTION
  • 2. Who figured out mostWho figured out most of what we knowof what we know aboutabout how things movehow things move??
  • 3. “If I have ever made any valuable discoveries, it has been owing more to patient attention, than to any other talent” Isaac Newton
  • 4. What is the law of motion? • Newton's laws of motionNewton's laws of motion are three physical laws which provide relationships between the forcesforces acting on a body and the motionmotion of the body.
  • 6. An object at rest tends to stay at rest and object in motion tends to stay in motion unless acted upon by an unbalanced force.
  • 7. What does this mean?! Basically, an object will keep doing what it was doing, unless acted on by an unbalanced force. If the object was sitting still, it will remain stationary. If it was moving at a constant velocity, it will keep moving. It takes force to change the motion of an object.
  • 8. What is meant by unbalanced force?
  • 9. If the forces on an object are equal and opposite, they are said to be balanced, and the object experiences no change in motion. If they are not equal and opposite, then the forces are unbalanced and the motion of the object changes.
  • 10. These are some examples from real life A soccer ball is sitting at rest. It takes an unbalanced force of a kick to change its motion.
  • 11.
  • 12. Newton’s First Law is also called the Law of Inertia Inertia: the tendency of an object to resist changes in its state of motion Inertia: the tendency of an object to resist changes in its state of motion The First Law states that all objects have inertia. The more mass an object has, the more inertia it has (and the harder it is to change its motion).
  • 13. More Examples from Real LifeMore Examples from Real Life A powerful locomotive begins to pull a long line of boxcars that were sitting at rest. Since the boxcars are so massive, they have a great deal of inertia and it takes a large force to change their motion. Once they are moving, it takes a large force to stop them.
  • 14. If objects in motion tend toIf objects in motion tend to stay in motion, why donstay in motion, why don’’tt moving objects keep movingmoving objects keep moving forever?forever?
  • 15. Things don’t keep moving forever because there’s almost always an unbalanced force acting upon it. A book sliding across a table slows down and stops because of the force of friction.
  • 16. If you throw a ball upwards it will eventually slow down and fall because of the force of gravity. If you throw a ball upwards it will eventually slow down and fall because of the force of gravity.
  • 18. Force equals mass times acceleration. F = ma AccelerationAcceleration: a measurement of how quickly an object is changing speed. Acceleration: a measurement of how quickly an object is changing speed
  • 19. What doesWhat does F = maF = ma meanmean?? Force is directly proportional to mass and acceleration. Imagine a ball of a certain mass moving at a certain acceleration. This ball has a certain force.
  • 20. Now imagine we make the ball twice as big (double the mass) but keep the acceleration constant. F = ma says that this new ball has twice the force of the old ball. Now imagine the original ball moving at twice the original acceleration. F = ma says that the ball will again have twice the force of the ball at the original acceleration.
  • 21. More aboutMore about F = maF = ma If you double the mass, you double the force. If you double the acceleration, you double the force. What if you double the mass and the acceleration? (2m)(2a) = 4F Doubling the mass and the acceleration quadruples the force. So . . . what if you decrease the mass by half? How much force would the object have now?
  • 22. What doesWhat does F = maF = ma saysay?? F = maF = ma basically means that the force of an object comes from its mass and its acceleration. Something very massive (high mass) that’s changing speed very slowly (low acceleration), like a glacier, can still have great force.
  • 23. Something very small (low mass) that’s changing speed very quickly (high acceleration), like a bullet, can still have a great force. Something very small changing speed very slowly will have a very weak force.
  • 24.
  • 26. For every action there is an equal and opposite reaction For every action there is an equal and opposite reaction
  • 27. What does this meanWhat does this mean?? For every force acting on an object, there is an equal force acting in the opposite direction. Right now, gravity is pulling you down in your seat, but Newton’s Third Law says your seat is pushing up against you with equal force. This is why you are not moving. There is a balanced force acting on you– gravity pulling down, your seat pushing up.
  • 28. Think about it. . . What happens if you are standing on a skateboard or a slippery floor and push against a wall? You slide in the opposite direction (away from the wall), because you pushed on the wall but the wall pushed back on you with equal and opposite force.
  • 29. Why does it hurt so much when you stub your toe? When your toe exerts a force on a rock, the rock exerts an equal force back on your toe. The harder you hit your toe against it, the more force the rock exerts back on your toe (and the more your toe hurts).
  • 30.
  • 31. ReviewReview Newton’s First Law: Objects in motion tend to stay in motion and objects at rest tend to stay at rest unless acted upon by an unbalanced force. Newton’s Second Law: Force equals mass times acceleration (F = ma). Newton’s Third Law: For every action there is an equal and opposite reaction.