Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 253 · 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.🛞 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, a carpet 8 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
2. 2.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
3. 3.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
4. 4.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
9. 9.True or false: chalk on a gym bar gives more friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a tyre with deep treads
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a wheel on ball bearings (d) a box pushed on carpet
12. 12.True or false: a rough doormat 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 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) skating on ice (d) a tyre with deep treads
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
16. 16.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
17. 17.True or false: a box pushed on carpet gives less friction. (a) False (b) True
18. 18.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
20. 20.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 5 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
24. 24.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
25. 25.True or false: a box pushed on carpet gives more friction. (a) True (b) False
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
28. 28.True or false: a tyre with deep treads gives less friction. (a) False (b) True
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) chalk on a gym bar (d) oil on a squeaky hinge
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
37. 37.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
38. 38.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
39. 39.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wheel on ball bearings

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