Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 858 · 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.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
2. 2.True or false: sand on a slippery path gives more friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) chalk on a gym bar (d) a box pushed on carpet
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
5. 5.True or false: a rough doormat gives less friction. (a) False (b) True
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 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) powder on a carrom board (d) a grippy rubber sole
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: a wet tiled floor gives less friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
13. 13.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
15. 15.True or false: powder on a carrom board gives less friction. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) sand on a slippery path (d) a wet tiled floor
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) powder on a carrom board (d) oil on a squeaky hinge
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
20. 20.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
24. 24.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
25. 25.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
26. 26.🛞 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 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
27. 27.True or false: a box pushed on carpet gives more friction. (a) True (b) False
28. 28.True or false: a smooth steel slide gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
30. 30.True or false: a smooth steel slide gives less friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) skating on ice (d) a wheel on ball bearings
32. 32.True or false: a rough doormat gives more friction. (a) False (b) True
33. 33.🛞 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 12 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (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 5 N, a carpet 8 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, a carpet 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a smooth steel slide (d) a grippy rubber sole

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