11F
Conservation of Momentum The total momentum before a collision is equal to the total momentum after a collision. Examples 1) A blue car of mass 800 kg moving at 8 m/s collides with a stationary red car of mass 500 kg. After the collision the two cars stick together. a) Calculate the momentum of the blue car before the collision b) State the momentum of the red car before the collision c) What is the total momentum before the collision? d) Therefore what is the total momentum after the collision? e) Calculate the total mass of the red and blue car when they are stuck together f) Find the speed of the red and blue car after the collision 2) two skateboarders (Fred with mass 80kg and Frederica with mass 60kg) are stationary next to each other. They then push on each other and Fred moves to the left with a speed of 4 m/s a) What is their total momentum before? b) So what is their total momentum after? c) Calculate Fred's momentum afterwards d) Hence, what is Frederica's momentum afterwards? e) Calculate Frederica's speed after Car Safety 11F
Momentum is defined as: Momentum = mass x velocity Units of momentum: kgm/s Questions: 1. A car of mass 500 kg travelling at 20 m/s 2. A motorbike of mass 250 kg travelling at 40 m/s 3. A 20 tonne train that moves 150 m in 5 minutes 4. A bullet of 50 grams travelling at twice the speed of sound Conservation of momentum: When 2 objects collide the total momentum is conserved. This means: Total momentum before collision = total momentum after collision 11C
recap GPE to KE transfer define power measure power of muscles Questions (to complete for h/w): 6,7,8 pg115, 3,4,5 pg114 11C
Recap work, Gravitational Potential Energy and Kinetic Energy. GPE to KE transfer |
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