Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 437 · 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.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
2. 2.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 14 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
5. 5.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a wet tiled floor (d) powder on a carrom board
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on ice?
8. 8.True or false: sand on a slippery path gives less friction. (a) False (b) True
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
10. 10.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
13. 13.True or false: a rough doormat gives less friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a smooth steel slide (d) oil on a squeaky hinge
20. 20.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
21. 21.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
22. 22.True or false: a tyre with deep treads gives less friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
26. 26.🛞 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 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
28. 28.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
29. 29.🛞 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 8 N. How many newtons more were needed on sandpaper than on ice?
30. 30.True or false: sand on a slippery path gives more friction. (a) True (b) False
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.True or false: a wet tiled floor gives less friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a box pushed on carpet (d) chalk on a gym bar
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
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 5 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.True or false: a box pushed on carpet gives less friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a grippy rubber sole (d) a wet tiled floor
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?

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