Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 772 · 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 wet tiled floor (b) chalk on a gym bar (c) a box pushed on carpet (d) sand on a slippery path
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 13 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
3. 3.🛞 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, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a wet tiled floor (d) a rough doormat
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) powder on a carrom board (d) a tyre with deep treads
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
8. 8.True or false: a smooth steel slide gives less friction. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a wheel on ball bearings (d) skating on ice
10. 10.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
11. 11.True or false: chalk on a gym bar gives less friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
13. 13.True or false: a box pushed on carpet gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, a carpet 13 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
17. 17.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
18. 18.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
27. 27.True or false: powder on a carrom board gives less friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a box pushed on carpet (d) a tyre with deep treads
30. 30.🛞 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 9 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
31. 31.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
35. 35.🛞 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 7 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
36. 36.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
37. 37.True or false: a wheel on ball bearings 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 carpet 4 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
39. 39.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper

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