Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 721 · 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: oil on a squeaky hinge? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
4. 4.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
5. 5.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
7. 7.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 13 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
9. 9.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a grippy rubber sole (d) a smooth steel slide
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
12. 12.True or false: a wet tiled floor gives less friction. (a) True (b) False
13. 13.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a wheel on ball bearings (d) a wet tiled floor
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) skating on ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wet tiled floor (d) a rough doormat
21. 21.🛞 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 carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
22. 22.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a box pushed on carpet (d) oil on a squeaky hinge
24. 24.True or false: a tyre with deep treads gives less friction. (a) False (b) True
25. 25.🛞 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. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
27. 27.True or false: sand on a slippery path gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, ice 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
31. 31.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
32. 32.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
34. 34.True or false: a grippy rubber sole gives less friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a rough doormat (d) powder on a carrom board
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 13 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice

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