Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 458 · 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: sandpaper 5 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
3. 3.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
4. 4.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a tyre with deep treads (d) skating on ice
6. 6.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
7. 7.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wheel on ball bearings (d) a rough doormat
9. 9.True or false: a smooth steel slide gives less friction. (a) True (b) False
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a tyre with deep treads (d) skating on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
15. 15.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) powder on a carrom board
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
19. 19.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) oil on a squeaky hinge (d) skating on ice
20. 20.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
21. 21.True or false: powder on a carrom board gives less friction. (a) False (b) True
22. 22.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
23. 23.True or false: a wet tiled floor gives more friction. (a) True (b) False
24. 24.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
25. 25.🛞 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 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
26. 26.True or false: a box pushed on carpet gives less friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) oil on a squeaky hinge (d) a wheel on ball bearings
28. 28.🛞 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 8 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
29. 29.True or false: a wet tiled floor gives less friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
31. 31.True or false: powder on a carrom board gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
33. 33.True or false: a box pushed on carpet gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
35. 35.True or false: skating on ice gives less friction. (a) True (b) False
36. 36.True or false: sand on a slippery path gives less friction. (a) False (b) True
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
39. 39.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
40. 40.🛞 More or less friction: skating on ice? (a) more friction (b) less friction

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