Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 410 · 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 save rubber (c) to go slower (d) to grip the road
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) sand on a slippery path (d) chalk on a gym bar
3. 3.🛞 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, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
4. 4.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) powder on a carrom board (d) a wheel on ball bearings
6. 6.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a smooth steel slide (d) powder on a carrom board
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) a wet tiled floor
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
13. 13.🛞 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 carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
15. 15.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a smooth steel slide (d) powder on a carrom board
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
17. 17.True or false: a grippy rubber sole gives less friction. (a) True (b) False
18. 18.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
19. 19.True or false: a smooth steel slide gives more friction. (a) False (b) True
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
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: gripping a cricket bat? (a) helpful (b) a problem
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a wheel on ball bearings (d) a grippy rubber sole
24. 24.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
26. 26.True or false: sand on a slippery path gives less friction. (a) True (b) False
27. 27.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
29. 29.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
30. 30.🛞 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 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
31. 31.True or false: a wet tiled floor gives less friction. (a) True (b) False
32. 32.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) powder on a carrom board (d) a wet tiled floor
38. 38.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank

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