Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 257 · 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: powder on a carrom board? (a) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
3. 3.True or false: chalk on a gym bar gives more friction. (a) False (b) True
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
5. 5.True or false: skating on ice gives more friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
8. 8.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a grippy rubber sole (d) a smooth steel slide
12. 12.True or false: skating on ice gives less friction. (a) True (b) False
13. 13.True or false: a box pushed on carpet gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) powder on a carrom board (d) chalk on a gym bar
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.True or false: a rough doormat gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
21. 21.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
22. 22.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
23. 23.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
24. 24.🛞 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 9 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) sand on a slippery path (d) powder on a carrom board
27. 27.True or false: powder on a carrom board gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
29. 29.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
30. 30.🛞 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, sandpaper 11 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a smooth steel slide (d) a box pushed on carpet
33. 33.🛞 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 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
34. 34.🛞 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 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
35. 35.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a wheel on ball bearings
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a grippy rubber sole (d) a wheel on ball bearings
38. 38.True or false: a wet tiled floor gives more friction. (a) True (b) False
39. 39.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
40. 40.True or false: a wheel on ball bearings gives more friction. (a) True (b) False

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