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Newton's laws of motion


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Newton's laws of motion

  1. 1. Newtons Laws of MotionMade by :NitinChhaperwal
  2. 2. IndexObjectivesForceNewton’s first lawInertiaNewton’s second lawNewton’s third lawEnd!
  3. 3. ObjectivesUnderstand the ideas of motion and forceDescribe Newtons three laws of motionUnderstand the idea of inertiaTest Newtons three laws of motion intheir class room
  4. 4. WHEN THERE IS A PULL ...WHEN THERE IS A PUSH...WHEN THERE IS A STRETCH...WHEN THERE IS A SQUEEZE ...WHEN THERE IS A TWIST...We experiences some effect called forces.We can’t see forces but we can see the effect of aforce.Force
  5. 5. The ball remains in its state of rest till an externalforce is acting on it.Newton’s first law
  6. 6. When an external force (push) is acting on a ball (object)at rest it changes its state (moves over the steps ).Newton’s first law (contd..)Push the ball
  7. 7. object in motion tends to stay in motionNewton’s first law (contd..)
  8. 8. When external force (Push of the rabbit)acting on the object (ball) which is inmotion the object changes its position.Newton’s first law (contd..)Push the ball
  9. 9. From the above observation...Newton’s first law (contd..)An object remains in its state of restif no external force is acting on it.An object remains in its state of motionif no external force is acting on it.An object changes its state of rest or uniformmotion if some external force acting on it.
  10. 10. An object at rest tends to stay at rest and an object inmotion tends to stay in motion with the same speed andin the same direction unless an external force is actingon it.The above three statement can be written as a singlestatement which is the Newton’s first lawIn other wordsEvery body continuous in its state of rest or in uniformmotion Unless an external force is acting on it.Newton’s first law (contd..)
  11. 11. When the car hits the wall……The moving car stopped when a force (from thewall) is acting on it.Driver who is moving along with the car could notable to stop himself when the car stopped.Driver has inability to change his position byhimself at that instant.Inertia
  12. 12. When the truck hits the car……The moving truck stopped when a force (from the car) isacting on it.Ladder which is moving along with the truck could not ableto stop itself when the truck stopped.Ladder has inability to change its position by itself at thatinstantInertia (contd..)
  13. 13. It is the natural tendency of objects to resist changes intheir state of motion.This tendency to resist changes in their state of motion isdescribed as inertia.This can be said in a single statementInability of an object to change its position by itselfis called Inertia.Inertia (contd..)
  14. 14. It is too hardIt is very easySmaller force is needed to move smaller massLarger force is needed to move larger massNewton’s second law
  15. 15. 10 n30 nSmaller force give smaller accelerationLarger force give Larger accelerationNewton’s second law (contd..)
  16. 16. If a bowling ball and a soccer ball were both dropped at the same time from the roof of a tall building, whichwould hit the ground with a greater force?Acceleration due to gravity accelerates downwards all objects at the same rate.Therefore the difference in forces would be caused by the different masses of the balls.The mass of the bowling ball is greater than the mass of the soccer ball.The bowling ball experience greater force than soccer ball.So, bowling ball hit the ground first.Newton’s second law (contd..)
  17. 17. Smaller force (F) is needed to move smaller mass (m)Larger force (F) is needed to move larger mass (m)So, Force is directly proportional to massF α mSmaller force (F) give smaller acceleration (a).Larger force (F) give smaller acceleration (a).So, Force is directly proportional to acceleration (a).F α aAcceleration is produced when a force acts on a mass.The greater the mass (of the object being accelerated) the greater the amount of force needed (toaccelerate the object).Newton’s second law states that the net force on anobject is proportional to the mass and the accelerationthat the object undergoes.F = maNewton’s second law (contd..)
  18. 18. Look at the flying motion of birds.A bird flies by the use of its wings.The wings of a bird push air downwards.The air reacts by pushing the bird upwards.The direction of the force on the air(downwards) is opposite to the direction of theforce on the bird (upwards).These two forces are equal and opposite.actionreactionNewton’s third law
  19. 19. Look at the flying motion of rocket.Hot gases are pushed out from the bottom ofthe rocket as the rocket is thrust upward.The force of the gases pushing against thesurface of the earth is equal and opposite tothe force with which the rocket movesupward.These two forces are equal and opposite.Newton’s third law (contd..)
  20. 20. Look at the recoil effect of the gun.When we trigger the gun, the gun pushes thebullet forwards and the bullet pushes the gunbackwards.The bullet has a greater acceleration due to thefact that it has a smaller mass. (Newtonssecond law)These two forces are equal and opposite.actionreactionTrigger the gunNewton’s third law (contd..)
  21. 21. Summary