GCSEPhysicsOCR GatewayExam Questions7. Energy7.1 Conservation of Energy

Conservation of Energy (OCR Gateway GCSE Physics)

Exam Questions

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7.1 Conservation of Energy

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7.1 Conservation of Energy

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1a2 marks

A car on a roller coaster is stationary at the top of a slope.

The car has a weight of 6 500 N and a potential energy of 217 000 J.

Calculate the cars height above the ground.

Answer = ......................... m

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1b2 marks

The diagram shows the roller coaster car moving down a slope.

q17b-paper4-specimen-ocr-gcse-physicsThe energy at the bottom of the slope is less than expected.

Suggest two ways to improve the efficiency of the roller coaster car.

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1a2 marks

The table shows the stopping distances for a car.

Speed of car
(m/s)		 Thinking
distance (m)		 Braking distance
(m)		 Stopping
distance (m)
4 3 1.5 4.5
8 6 6 12
16 12 24 36
32 24 ................ ...............

a)
Add the missing results to the table at a speed of 32 m/s.
[2]

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1b2 marks

Higher Tier Only

b)
The car takes 6 m to brake when moving at 8 m/s.

Look at the graph of the car as it starts to brake and then stop.
 
q25b-paper4-specimen-ocr-gcse-physics
 
Use the graph to show that the braking distance is 6 m.

[2]

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1c2 marks
c)
The formula to work out kinetic energy is:

   kinetic energy = 0.5 × mass × (velocity2)

A car has 30 000 J of energy and a mass of 1 tonne (1 tonne = 1 000 kg).

Calculate the velocity of the car and show your working.

Answer = ......................... m/s [2]

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1d4 marks
d)
Cars and lorries have different brakes.

  • Brakes absorb the energy of the vehicle before it comes to rest.
  • The brakes on lorries have larger brake discs and brake pads than cars.
  • Brakes are designed to increase airflow.
Explain why increased airflow is more important for lorries than cars.

[4]

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