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Newton’s 3 rd Law

Newton’s 3 rd Law. #1) True: Ex: Rocket: Action force = gases escaping out of back end of rocket Reaction force = gases exert a force on rocket causing the launch Ex: trampoline: Action force = feet pushing down Reaction force = trampoline pushing up causing you to fly in air.

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Newton’s 3 rd Law

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  1. Newton’s 3rd Law

  2. #1) True: • Ex: Rocket: Action force = gases escaping out of back end of rocket • Reaction force = gases exert a force on rocket causing the launch • Ex: trampoline: Action force = feet pushing down • Reaction force = trampoline pushing up causing you to fly in air

  3. Ex: bird flying: Action force = wings pushing on air Reaction force = air pushes back on the wings

  4. #2) False: Both forces are equal, the fly died because it had a smaller mass.

  5. #3) True

  6. #4) False: All action-reaction forces have to be equal and act on different objects! • Ex: Swimmer: action force = arms push on water reaction force = water pushes on her • Force on water and force on body! Unbalanced force on her causes her to move!

  7. #5) True: • Action force = cable pulling up • Reaction force = gravity pulling down

  8. #6) False: Person in the semi was less injured because the truck had more momentum! • Both were traveling at the same speed but the truck had more mass!

  9. #7) False: Momentum CAN be transferred through objects. • Ex: Game of pool: balls are motionless, cue ball strikes the others causing movement! Momentum was transferred.

  10. #8) True: Momentum was transferred from the runner to player with the ball.

  11. #9) True: Same mass, different velocities/speeds!

  12. #10) False: A person standing in the middle of the park has no momentum! • You have to be moving to have momentum!

  13. Momentum Calculationsp = m x v • 1) 3 kg swung at 1.5 m/s 3 kg swung at 0.9 m/s

  14. p = m x v • 2) Golf Ball • Baseball

  15. p = m x v • 4) 250 kg dolphin swimming at 6 m/s • 250 kg manatee swimming at 2 m/s

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