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Edexcel Homework for Topic 10
                            (Rollercoasters and relativity)

Questions 1: Work
1. Three people do 2,000 J of work; what distance do they move if:
(a) person A exerts a force of 200 N?
(b) person B pushes with a force of 50 N?
(c) person C uses a force of 0.8 N?

2. How much work is done if:
(a) a man weighs 750 N and uses the stairs to climb 50 m
(b) a woman lifts a 400 N rucksack onto her back, a height of 1.2 m
(c) a pebble of weight 0.2 N is thrown 5 m into the air?

3. A lorry takes 30 m to slow down and stop. If its brakes exert a force of
20,000 N, then:
(a) how much work do the brakes do
(b) what is the maximum amount of heat generated
(c) how much kinetic energy did the lorry have?


Questions 2: Power
1. Calculate the power of an engine that can:
(a) do 1,200 joules of work in 4 seconds
(b) lift a 200 N weight through 30 metres in 12 seconds
(c) drive a car 500 metres in 25 seconds against air resistance of 3,000 N.

2. A machine has a power output of 500 kilowatts.
(a) How quickly will it do 4,000 kJ of work?
(b) How much work can it do in one minute?


Questions 3: Kinetic Energy
1. Explain, using the words kinetic energy, work, thermal energy, why a car
travelling at 10 m/s (22.5 miles per hour) can brake in a quarter of the distance
needed by a car travelling at 20 m/s (45 miles per hour).

2. Calculate the kinetic energy of:
(a) a person of mass 70 kg running at 8 m/s
(b) a rabbit of mass 4 kg hopping at 15 m/s
(c) a ball bearing of mass 0.016 kg rolling at 3 m/s.


Questions 4: Potential Energy
1. Explain, using the words energy, work, potential, kinetic and velocity why a
roller coaster gets faster as it goes down a slope.

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Monday Homework

  • 1. Edexcel Homework for Topic 10 (Rollercoasters and relativity) Questions 1: Work 1. Three people do 2,000 J of work; what distance do they move if: (a) person A exerts a force of 200 N? (b) person B pushes with a force of 50 N? (c) person C uses a force of 0.8 N? 2. How much work is done if: (a) a man weighs 750 N and uses the stairs to climb 50 m (b) a woman lifts a 400 N rucksack onto her back, a height of 1.2 m (c) a pebble of weight 0.2 N is thrown 5 m into the air? 3. A lorry takes 30 m to slow down and stop. If its brakes exert a force of 20,000 N, then: (a) how much work do the brakes do (b) what is the maximum amount of heat generated (c) how much kinetic energy did the lorry have? Questions 2: Power 1. Calculate the power of an engine that can: (a) do 1,200 joules of work in 4 seconds (b) lift a 200 N weight through 30 metres in 12 seconds (c) drive a car 500 metres in 25 seconds against air resistance of 3,000 N. 2. A machine has a power output of 500 kilowatts. (a) How quickly will it do 4,000 kJ of work? (b) How much work can it do in one minute? Questions 3: Kinetic Energy 1. Explain, using the words kinetic energy, work, thermal energy, why a car travelling at 10 m/s (22.5 miles per hour) can brake in a quarter of the distance needed by a car travelling at 20 m/s (45 miles per hour). 2. Calculate the kinetic energy of: (a) a person of mass 70 kg running at 8 m/s (b) a rabbit of mass 4 kg hopping at 15 m/s (c) a ball bearing of mass 0.016 kg rolling at 3 m/s. Questions 4: Potential Energy 1. Explain, using the words energy, work, potential, kinetic and velocity why a roller coaster gets faster as it goes down a slope.