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Newton ‘s laws of motion
Sir Isaac Newton (1642 – 1727) ,[object Object],[object Object]
“ If I have ever made any valuable discoveries, it has been owing more to patient attention, than to any other talent.” -Sir Isaac Newton
Newton’s First Law 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.
Newton’s 1 st  Law of Motion
What does this mean? ,[object Object],[object Object],[object 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 Examples from Real Life ,[object Object],A soccer ball is sitting at rest.  It takes an unbalanced force of a kick to change its motion.
1 st  Law  ,[object Object]
1 st  Law  ,[object Object]
Why was it  so difficult to stop the TITANIC from colliding with the iceberg?
The mass of the Titanic is very large. Inertia is proportionate to mass. The Titanic could not change its direction because its extremely high inertia forces it to continue in a straight line, thereby colliding with the iceberg. menu
Newton’s Second Law The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
What does F = ma mean? ,[object Object],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 about F = ma ,[object Object],[object Object],[object Object],[object Object],[object Object]
What does F = ma say? F = ma basically means that the force of an object comes from its mass and its acceleration.  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. Something very massive (high mass) that’s changing speed very slowly (low acceleration), like a glacier, can still have great force.
What is the function of the hand glove of this baseball player?
The hand glove increases the time of the collision, thereby reducing the force. F = ma  = m  (v-u)    t menu Force is inversely proportional  to time
Check Your Understanding ,[object Object],[object Object],[object Object],[object Object]
Check Your Understanding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Newton’s Third Law ,[object Object]
3 rd  Law ,[object Object]
3 rd  Law ,[object Object]
3 rd  Law 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. Reaction Force
3 rd  Law 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.
How does a rocket work?
Rocket Pushes Gas
How does a jet plane work?
Review ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],EXIT
T H A N K Y O U By PAVAN KUMAR  09P1254 1 PCME ‘I’

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newton's laws of motion

  • 1. Newton ‘s laws of motion
  • 2.
  • 3. “ If I have ever made any valuable discoveries, it has been owing more to patient attention, than to any other talent.” -Sir Isaac Newton
  • 4. Newton’s First Law 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.
  • 5. Newton’s 1 st Law of Motion
  • 6.
  • 7. 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.
  • 8.
  • 9.
  • 10.
  • 11. Why was it so difficult to stop the TITANIC from colliding with the iceberg?
  • 12. The mass of the Titanic is very large. Inertia is proportionate to mass. The Titanic could not change its direction because its extremely high inertia forces it to continue in a straight line, thereby colliding with the iceberg. menu
  • 13. Newton’s Second Law The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
  • 14.
  • 15.
  • 16. What does F = ma say? F = ma basically means that the force of an object comes from its mass and its acceleration. 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. Something very massive (high mass) that’s changing speed very slowly (low acceleration), like a glacier, can still have great force.
  • 17. What is the function of the hand glove of this baseball player?
  • 18. The hand glove increases the time of the collision, thereby reducing the force. F = ma = m (v-u) t menu Force is inversely proportional to time
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.
  • 24. 3 rd Law 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. Reaction Force
  • 25. 3 rd Law 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.
  • 26. How does a rocket work?
  • 28. How does a jet plane work?
  • 29.
  • 30. T H A N K Y O U By PAVAN KUMAR 09P1254 1 PCME ‘I’