Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 402 · 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.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
2. 2.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
3. 3.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) oil on a squeaky hinge (d) a grippy rubber sole
4. 4.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
5. 5.🛞 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, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
10. 10.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
12. 12.True or false: sand on a slippery path gives less friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
15. 15.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
25. 25.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) chalk on a gym bar (d) skating on ice
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
29. 29.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a box pushed on carpet (d) a grippy rubber sole
30. 30.True or false: a smooth steel slide gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
32. 32.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
33. 33.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
34. 34.True or false: skating on ice gives less friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 8 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: chalk on a gym bar gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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