Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 510 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a box pushed on carpet (d) a smooth steel slide
5. 5.True or false: skating on ice gives more friction. (a) True (b) False
6. 6.True or false: chalk on a gym bar gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) chalk on a gym bar (d) powder on a carrom board
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
11. 11.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
12. 12.True or false: sand on a slippery path gives less friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
16. 16.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
18. 18.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
20. 20.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.True or false: a grippy rubber sole gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a tyre with deep treads (d) a wheel on ball bearings
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
29. 29.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
30. 30.True or false: a rough doormat gives more friction. (a) False (b) True
31. 31.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
33. 33.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) powder on a carrom board (d) a wet tiled floor
36. 36.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
39. 39.True or false: chalk on a gym bar gives less friction. (a) True (b) False
40. 40.True or false: a rough doormat gives less friction. (a) False (b) True

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