Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 768 · 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.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a wheel on ball bearings (d) a grippy rubber sole
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
5. 5.True or false: chalk on a gym bar gives less friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
7. 7.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
8. 8.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
9. 9.True or false: powder on a carrom board gives more friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a rough doormat
11. 11.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) a grippy rubber sole (d) chalk on a gym bar
13. 13.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
19. 19.True or false: powder on a carrom board gives less friction. (a) False (b) True
20. 20.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
21. 21.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
22. 22.True or false: sand on a slippery path gives more friction. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) a rough doormat (d) chalk on a gym bar
24. 24.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.True or false: a box pushed on carpet gives less friction. (a) True (b) False
30. 30.True or false: a tyre with deep treads gives less friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) powder on a carrom board (d) a smooth steel slide
32. 32.🛞 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 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 9 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.True or false: skating on ice gives more friction. (a) True (b) False
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 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.True or false: chalk on a gym bar gives more friction. (a) False (b) True

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