p2 topic 4

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what is the momentum of a 5 kg object moving with a velocity of 2 m/s?
momentum = 5 × 2 = 10 kg m/s
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Two railway carriages collide and move off together. Carriage A has a mass of 12,000 kg and moves at 5 m/s before the collision. Carriage B has a mass of 8,000 kg and is stationary before the collision. What is the velocity of the two carriages after
Step 1 Work out the total momentum before the event (before the collision): p = m × v Momentum of carriage A before = 12,000 × 5 = 60,000 kg m/s Momentum of carriage B before = 8,000 × 0 = 0 kg m/s Total momentum before = 60,000 + 0 = 60,000 kg m/s
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, what force is needed to get a 25 kg stationary bicycle moving at 12 m/s in 5 s?
Momentum at start = 25 × 0 = 0 kg m/s Momentum at end = 25 × 12 = 300 kg m/s Change in momentum = 300 – 0 = 300 kg m/s Force = change in momentum ÷ time = 300 ÷ 5 = 60 N
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what are the purpose of car safety features
To increase the time it takes for momentum to reach 0
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How do you calculate Kinetic and gravitational potential energy
Kinetic: 1/2 * Mass * Velocity Gravitational Potential: Mass *Gravitational Field * Height
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What is meant by 'work done'
when a force is applied to an object moves the object
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What is the kinetic energy converted when a car brakes?
Throughout the swing the total KE and GPE is constant.
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What is the correct unit for power?
watts
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What is the power of an engine that does 6000J of work in 60s?
100W
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What distance will be moved when 200J of work are done with a force of 10N?
20m
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What is the weight of a person on Earth whose mass is 50Kg?
500N
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What is the kinetic energy of a cyclist with a mass of 50kg moving at 5m/s?
625J
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What is the kinetic energy converted when a car brakes?
Heat
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Card 2

Front

Two railway carriages collide and move off together. Carriage A has a mass of 12,000 kg and moves at 5 m/s before the collision. Carriage B has a mass of 8,000 kg and is stationary before the collision. What is the velocity of the two carriages after

Back

Step 1 Work out the total momentum before the event (before the collision): p = m × v Momentum of carriage A before = 12,000 × 5 = 60,000 kg m/s Momentum of carriage B before = 8,000 × 0 = 0 kg m/s Total momentum before = 60,000 + 0 = 60,000 kg m/s

Card 3

Front

, what force is needed to get a 25 kg stationary bicycle moving at 12 m/s in 5 s?

Back

Preview of the front of card 3

Card 4

Front

what are the purpose of car safety features

Back

Preview of the front of card 4

Card 5

Front

How do you calculate Kinetic and gravitational potential energy

Back

Preview of the front of card 5
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