Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 534 · 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: sand on a slippery path? (a) more friction (b) less friction
2. 2.True or false: a grippy rubber sole gives less friction. (a) True (b) False
3. 3.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
4. 4.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
5. 5.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
9. 9.True or false: a wet tiled floor gives less friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) sand on a slippery path (d) a tyre with deep treads
13. 13.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a smooth steel slide
14. 14.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) skating on ice (d) a box pushed on carpet
17. 17.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
18. 18.True or false: chalk on a gym bar gives more friction. (a) False (b) True
19. 19.🛞 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 10 N, a carpet 12 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
20. 20.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
21. 21.True or false: a box pushed on carpet gives more friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
24. 24.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
25. 25.True or false: a rough doormat gives less friction. (a) True (b) False
26. 26.True or false: powder on a carrom board gives more friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
31. 31.True or false: a wet tiled floor gives more friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a grippy rubber sole (d) a rough doormat
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a rough doormat (d) a wet tiled floor
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
37. 37.True or false: skating on ice gives less friction. (a) True (b) False
38. 38.True or false: sand on a slippery path gives less friction. (a) False (b) True
39. 39.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) a tyre with deep treads

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