Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 60 · 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.True or false: a smooth steel slide gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
3. 3.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
7. 7.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a box pushed on carpet (d) powder on a carrom board
10. 10.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
11. 11.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a grippy rubber sole (d) powder on a carrom board
20. 20.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
23. 23.True or false: chalk on a gym bar gives more friction. (a) False (b) True
24. 24.True or false: chalk on a gym bar gives less friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a smooth steel slide (d) a box pushed on carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
38. 38.True or false: a grippy rubber sole gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: powder on a carrom board gives more friction. (a) False (b) True

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