Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 70 · 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.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) powder on a carrom board (d) a rough doormat
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 carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
10. 10.True or false: powder on a carrom board gives more friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a tyre with deep treads (d) a box pushed on carpet
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a wheel on ball bearings
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
17. 17.True or false: sand on a slippery path gives less friction. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
20. 20.🛞 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 4 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
22. 22.True or false: a box pushed on carpet gives more friction. (a) False (b) True
23. 23.True or false: a rough doormat gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.True or false: a tyre with deep treads gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
27. 27.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) powder on a carrom board (d) a tyre with deep treads
28. 28.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
29. 29.True or false: a tyre with deep treads gives more friction. (a) False (b) True
30. 30.🛞 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 carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.True or false: powder on a carrom board gives less friction. (a) True (b) False
33. 33.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
37. 37.True or false: chalk on a gym bar gives more friction. (a) True (b) False
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wheel on ball bearings
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful

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