Engineering Worksheet: Friction

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

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