CIE A Level Maths: Mechanics復習筆記5.1.1 Momentum
Momentum
What is momentum?
- Any object that has mass and is moving has?momentum
- Momentum?measures the quantity of motion that an object has
Momentum is a?vector?quantity - so it has a?magnitude?and?direction
- The?direction of the momentum?of a particle is the?same?as the?direction of motion?of the particle
- The?momentum is negative?if the?velocity is negative
- If an object is falling vertically then momentum will be downwards
What happens when two objects are in contact?
- If two objects are in contact with each other then by?Newton’s Third Law?there will be?equal?and?opposite?reaction forces
- One object gains momentum from the impact and the other loses momentum
- The change in momentum will be equal for each particle provided there are no external forces
- Remember momentum is a vector and can be negative
- For example, consider the scenario where a tennis ball is struck by a racket, suppose the momentum of the racket and the ball before the impact is 5 kg m s-1? and? -3 kg m s-1? and the momentum of the racket afterwards is -2 kg m s-1
- This means the racket has a loss of 7 kg m s-1?in momentum
- Therefore the ball has a gain of 7 kg m s-1?in momentum
- Therefore the momentum of ball after the impact is 4 kg m s-1
Worked Example
轉載自savemyexams
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