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LAWS OF MOTION
Background
Newton’s Laws of Motion
• Fist law: Objects in motion tend to stay in motion and objects at rest tent to stay
at rest unless acted upon by an unbalanced force.
• Second law: the acceleration of an object is directly proportional to the net force
acting on it and is inversely proportional to the object’s mass.The direction of the
acceleration is in the direction of the net force on the object.
(F = ma)
• Third law: for every action, there is always an equal and opposite reaction.
Newton’s First Law : Inertia
• An object at rest tends to stay at rest and an object in motion tends to stay in
motion unless acted upon by an unbalanced force.
What does this mean?
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.
Some example from Real Life
• A soccer ball is sitting at rest. It takes an
unbalanced force of a kick to change its
motion.
• Two teams are playing tug of war.They
are both exerting equal force on the rope
in opposite directions.This balanced force
results in no change of motion.
LAW OF INERTIA
All objects have inertia.
If objects in motion tend to stay in motion, why
don’t moving objects keep moving 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
Newton’s Second Law : Acceleration
• A measurement of how quickly an object is changing speed.
Force equals mass times acceleration
F = ma
What does F=ma mean?
• Force is directly proportional to mass and acceleration.
• F=ma basically means that the force of an object comes from its mass and its
acceleration.
• Doubling the mass and the acceleration quadruples' the force.
(2m)(2a)= 4F
• So, what if you decrease the mass by half? How much force would the object have
now?
Glaciers Bullet
Newton’sThird Law : Interaction
For every force acting on an object, there is an equal force
acting in the opposite direction.
Newton’s Law of
Motion Review
•First Law: Objects in motion tend to stay
in motion and objects at rest tent to stay
at rest unless acted upon by an
unbalanced force.
•Second Law: Force equals mass times
acceleration.
•Third Law: for every action there is an
equal and opposite direction.

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LAWS OF MOTION.pptx

  • 3. Newton’s Laws of Motion • Fist law: Objects in motion tend to stay in motion and objects at rest tent to stay at rest unless acted upon by an unbalanced force. • Second law: the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to the object’s mass.The direction of the acceleration is in the direction of the net force on the object. (F = ma) • Third law: for every action, there is always an equal and opposite reaction.
  • 4. Newton’s First Law : Inertia • An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force. What does this mean? It takes force to change the motion of an object.
  • 5. 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.
  • 6. Some example from Real Life • A soccer ball is sitting at rest. It takes an unbalanced force of a kick to change its motion. • Two teams are playing tug of war.They are both exerting equal force on the rope in opposite directions.This balanced force results in no change of motion.
  • 7. LAW OF INERTIA All objects have inertia.
  • 8. If objects in motion tend to stay in motion, why don’t moving objects keep moving 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
  • 9. Newton’s Second Law : Acceleration • A measurement of how quickly an object is changing speed. Force equals mass times acceleration F = ma
  • 10. What does F=ma mean? • Force is directly proportional to mass and acceleration. • F=ma basically means that the force of an object comes from its mass and its acceleration. • Doubling the mass and the acceleration quadruples' the force. (2m)(2a)= 4F • So, what if you decrease the mass by half? How much force would the object have now?
  • 12. Newton’sThird Law : Interaction For every force acting on an object, there is an equal force acting in the opposite direction.
  • 13. Newton’s Law of Motion Review •First Law: Objects in motion tend to stay in motion and objects at rest tent to stay at rest unless acted upon by an unbalanced force. •Second Law: Force equals mass times acceleration. •Third Law: for every action there is an equal and opposite direction.

Editor's Notes

  1. Sir Isaac Newton (1643-1727) an English scientist and mathematician famous for his discovery of the law of gravity also discovered the three laws of motion.
  2. The more mass an object has, the moore inertia it has (and the harder it is to change its motion).
  3. If you double the mass, you double the force. If you double the acceleration, you double the force.