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Conservation of Momentum

Conservation of Momentum. October 19, 2005. 60. 5. 0. 0. Two objects are known to have the same momentum. Do these two objects necessarily have the same kinetic energy?. Yes No. 60. 5. 0. 0.

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Conservation of Momentum

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  1. Conservation of Momentum October 19, 2005

  2. 60 5 0 0 Two objects are known to have the same momentum. Do these two objects necessarily have the same kinetic energy? • Yes • No

  3. 60 5 0 0 A net force of 200 N acts on a 100 kg boulder, and a force of the same magnitude acts on a 130 g pebble. How does the rate of change of the boulder’s momentum compare to the rate of change of the pebble’s momentum? • Greater than • Less than • Equal to

  4. 60 F F heavy 5 light 0 0 Two boxes, one heavier than the other, are initially at rest on a horizontal frictionless surface. The same constant force F acts on each one for exactly 1 second. Which box has more momentum after the force acts? • The lighter one • The heavier one • Both the same

  5. 60 5 0 0 In the previous question, which box has the larger velocity after the force acts? • The lighter one • The heavier one • Both the same

  6. Answers No. Try M = 2m, but V= v/2 3 - equal, F=change in momentum per unit time=rate of change of momentum 3 – both the same, see above 1 – the lighter one, p=mv, if same p then small m means big v

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