Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 733 · 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.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
2. 2.True or false: a tyre with deep treads gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wheel on ball bearings (d) sand on a slippery path
4. 4.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.True or false: sand on a slippery path gives more friction. (a) True (b) False
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
14. 14.True or false: a tyre with deep treads gives less friction. (a) True (b) False
15. 15.True or false: a smooth steel slide gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
17. 17.True or false: powder on a carrom board gives more friction. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) chalk on a gym bar (d) a wet tiled floor
19. 19.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a rough doormat (d) a grippy rubber sole
22. 22.🛞 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 3 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 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 7 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 More or less friction: a wet tiled floor? (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 5 N, sandpaper 6 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 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
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, a glass sheet 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
38. 38.🛞 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 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
39. 39.True or false: sand on a slippery path gives less friction. (a) True (b) False
40. 40.True or false: skating on ice gives less friction. (a) True (b) False

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