Newton's first and second Law's

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  • Why do we have to use so much force to do a pirouette, but once we start it is hard to stop?
  • Great question! You see, you are full of inertia, that's the tendency of objects to keep doing what they are doing, so if you are standing you have to use force to get your body to turn, and then more force to get it to stop because your energy just wants to stay in the same position. The only reason you dont spin forever is because of friction, which can be anything pushing aganist you such as the air or your shoe sliding on the floor.
  • Ok, I get it now. So basically everything is lazy, and if we want to change position we have to use force or else we will keep doing whatever it is until friction slows us down?
  • yep!
  • Ugh, why do I have to use so much more force to pull the smaller bag at the same speed as the bigger one??
  • Oh, ok I think I get it. So size doesnt matter, just mass? 
  • Obviously Dad, we put the heavier stuff in the tiny bag, so it has more mass. The mass times the accelartion equals force, and because the smaller bag has more mass but the same acceleration of course it takes more force.
  • Yes, it's also called Newtons Second Law of Force and Acceleration
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