Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 133 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
2. 2.True or false: a smooth steel slide gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, ice 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a rough doormat (d) a smooth steel slide
5. 5.True or false: a wet tiled floor gives more friction. (a) True (b) False
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
7. 7.🛞 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 carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
8. 8.True or false: skating on ice gives more friction. (a) True (b) False
9. 9.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
11. 11.🛞 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 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
12. 12.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
19. 19.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) a wheel on ball bearings
21. 21.🛞 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 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
23. 23.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
24. 24.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.True or false: chalk on a gym bar gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
31. 31.True or false: skating on ice gives less friction. (a) True (b) False
32. 32.🛞 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 wooden plank 11 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
35. 35.🔍 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) chalk on a gym bar
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a grippy rubber sole (d) a tyre with deep treads
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank

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