Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 958 · 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: a smooth steel slide? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) chalk on a gym bar
4. 4.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
10. 10.True or false: a smooth steel slide gives more friction. (a) True (b) False
11. 11.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
12. 12.True or false: a grippy rubber sole 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: a wooden plank 8 N, a carpet 9 N, sandpaper 13 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
16. 16.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
17. 17.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
18. 18.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
21. 21.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
26. 26.True or false: a wet tiled floor gives more friction. (a) False (b) True
27. 27.True or false: a box pushed on carpet gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.True or false: chalk on a gym bar gives less friction. (a) False (b) True
31. 31.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
33. 33.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a wheel on ball bearings (d) a tyre with deep treads
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem

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