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Basil George Kuriakose
[object Object]
[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object]
[object Object],[object Object],[object Object]
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.
[object Object],A soccer ball is sitting at rest.  It takes an unbalanced force of a kick to change its motion.
[object Object]
[object Object],[object Object]
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. On your way to school, a bug flies into your windshield.  Since the bug is so small, it has very little inertia and exerts a very small force on your car (so small that you don’t even feel it).
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 .
In outer space, away from gravity and any sources of friction, a rocket ship launched with a certain speed and direction would  keep going in that same direction and at that same speed forever .
[object Object],[object Object],Acceleration : a measurement of how quickly an object is changing speed.
[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.
[object Object],[object Object],[object Object],[object Object],[object Object]
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.
[object Object]
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.
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).
 

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1 discoveringnewtonslaws

  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7. 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. 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. On your way to school, a bug flies into your windshield. Since the bug is so small, it has very little inertia and exerts a very small force on your car (so small that you don’t even feel it).
  • 12. 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 .
  • 13. In outer space, away from gravity and any sources of friction, a rocket ship launched with a certain speed and direction would keep going in that same direction and at that same speed forever .
  • 14.
  • 15.
  • 16.
  • 17. 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.
  • 18.
  • 19. 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.
  • 20. 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).
  • 21.