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Presentation On Momentum

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Published in: Physics
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This PPT is suitable for the IGCSE and O Level Physics students. It only provides theoretical background of the topic. The practice questions, worksheets and topical questions will be discussed during the tutoring sessions

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  1. Momentum Physics (IGCSE / O-Level)
  2. What will you learn in this lesson? • Impulse of the force • Momentum • Principle of the conservation of momentum
  3. Impulse of the Force The effect of a force F depends on two things which is calculated by impulse: • how big the force is • the time At it acts for. jmpUlSe—fOrce the(fOrcetaet$ Fat' s The impulse equation will be FAt = mv — mu The quantity on the left , FAt, is called the impulse of the force. On the right we have mv (mass x final velocity) and mu (mass x initial velocity).
  4. Momentum The quantity mass x velocity is known as the momentum (p) of the object impulse offirce = Kfmomentum So the impulse will be: Substituting and re-arranging the resultant force F = ma will give, resultant fijrce change in momentum unit time
  5. Momentum (contd.) scientists test the safety features of a car by crashing it into a large block of concrete. A crash test dummy sits in the driver's seat. A Video camera records the crash. In one test, the car is travelling at 13 m/s and the dummy has a mass of 83 kg. a b c d State the equation that links momentum, mass and velocity. calculate the momentum of the dummy. In another test, the momentum of the dummy changes by 1250 kg rn/s in a time of 0.17 s. calculate the average force acting on the dummy during this time. These tests help to make our roads safer. Use ideas about momentum to explain how seat belts and the crumple zones Of a car help to reduce injuries during a crash.
  6. Momentum of collision If one object gains momentum, then the other loses an equal amount of momentum. This is known as the principle of the conservation of momentum. total momentlun beßre = total momentum after
  7. Momentum of collision (contd.) m=3.okg m = 0.25kg m = 3 kg m = 025 kg u. 20m/s u —o v — 18 Tv's v —24m/s atter Find: a. the momentum of the racket before and after the collision b. the momentum of the ball after the collision c. the velocity of the ball.

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