Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 601 · 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: writing with a pencil? (a) helpful (b) a problem
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) powder on a carrom board
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a wheel on ball bearings (d) a grippy rubber sole
4. 4.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
5. 5.True or false: a tyre with deep treads gives more friction. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a tyre with deep treads (d) a wheel on ball bearings
7. 7.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a rough doormat (d) a grippy rubber sole
9. 9.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
10. 10.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
11. 11.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
16. 16.🛞 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 wooden plank 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
17. 17.True or false: powder on a carrom board gives less friction. (a) True (b) False
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
19. 19.True or false: a smooth steel slide gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🛞 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 wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 6 N, ice 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
26. 26.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) skating on ice (d) powder on a carrom board
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
30. 30.True or false: chalk on a gym bar gives less friction. (a) True (b) False
31. 31.True or false: a grippy rubber sole gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
33. 33.True or false: chalk on a gym bar gives more friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) sand on a slippery path (d) powder on a carrom board
35. 35.True or false: a smooth steel slide gives less friction. (a) True (b) False
36. 36.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.True or false: oil on a squeaky hinge 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 glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
40. 40.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts

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