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Momentum and Impulse

Momentum and Impulse. Momentum and Impulse. Which of the following objects are more difficult to catch? Why?. Baseball versus a bullet?. Bullet as it has larger speed!. Football versus a shot put?. Shotput as it has larger mass!. Momentum : describes the “quantity of motion” of a

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Momentum and Impulse

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  1. Momentum and Impulse

  2. Momentum and Impulse Which of the following objects are more difficult to catch? Why? Baseball versus a bullet? Bullet as it has larger speed! Football versus a shot put? Shotput as it has larger mass! Momentum: describes the “quantity of motion” of a moving object - it is the product of an object’s mass and velocity Note: momentum is a vector quantity units: kgm/s

  3. What is the momentum of the following objects? A 100.0 g baseball travelling at 15.0 m/s [West]? A 8.00 g bullet travelling at 900.0 m/s [ East]? Ans: a) 1.5 kgm/s [West] b) 7.2 kgm/s [East] Impulse An object’s momentum changes when it accelerates. A net, unbalanced force acting on an object causes it to change its momentum!

  4. The change in momentum can be related to the net force through Newton’s second Law:

  5. -Ft is the IMPULSE -it is equal to the change in momentum -units: Ns -The net force is related rate of change of momentum -A smaller force can be used to cause the same change of momentum if the change occurs over a longer time interval!

  6. F versus t Graph: On a Force versus Time graph, the impulse is found by calculating the AREA under the curve! F t Example: A billiard ball of mass 200.0 g rolls toward the right-hand cushion of a billiard table at 3.00 m/s [Right] and rebounds straight back at 3.00 m/s [ Left]. What is the ball’s change in momentum? What is the impulse given to the ball by the cushion? If the interaction between the ball and cushion lasted 50.0 ms, what was the average force of the cushion on the ball? Ans: 1.20 kgm/s [ Left] b) 1.20 kgm/s[Left] c) 24.0 N [Left]

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