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Edexcel iGCSE digital textbooks
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 Edexcel iGCSE Physics book cover  Edexcel iGCSE Physics book cover
13-14. What are the missing labels on this Sankey diagram for a desk lamp?
(All labels show energy transfers).		desk lamp

electrical
energy
5000J

 sankey arrow

light energy

4200 J of wasted

energy

The following list gives improvements made to a house. Which type of energy transfer is REDUCED with this improvement?
15. Carpets added
16. Draught excluders under doors
17. Silver lining on roof insulation

18-20: A ball rolls down a slope and up the other side .

Where on the diagram does the ball ...

 ball in a bowl
18. have the least kinetic energy?
19. have the most potential energy?
20. have increasing kinetic and decreasing potential energy?

21. A tennis ball of mass 100g is thrown at a speed of 8 m/s. It has a kinetic energy of:

  • A) 3.2 J
  • B) 6.4 J
  • C) 3200 J
  • D) 6400 J

22. Which of these is the correct formula for potential energy?

  • A) g.p.e. = mv
  • B) g.p.e. = Fd
  • C) g.p.e. = ma
  • D) g.p.e. = mgh

23-25. A 4kg brick is held 20m above the ground.

23. The potential energy of the brick is  .
24. When it is dropped it hits the ground with a kinetic energy of     (ignoring air friction).
25. The velocity on impact is    .