Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 184 · 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: chalk on a gym bar? (a) more friction (b) less friction
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
3. 3.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
4. 4.🛞 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 least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) oil on a squeaky hinge
7. 7.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
8. 8.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a grippy rubber sole (d) a rough doormat
13. 13.True or false: a wet tiled floor gives more friction. (a) True (b) False
14. 14.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
15. 15.🛞 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, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: powder on a carrom board 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: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
23. 23.True or false: a rough doormat gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on 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 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
28. 28.True or false: a smooth steel slide gives less friction. (a) True (b) False
29. 29.True or false: a rough doormat gives more friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) sand on a slippery path
32. 32.🛞 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 5 N, sandpaper 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.True or false: chalk on a gym bar gives less friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a rough doormat (d) a grippy rubber sole
39. 39.True or false: a smooth steel slide gives more friction. (a) False (b) True
40. 40.True or false: sand on a slippery path gives less friction. (a) True (b) False

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