Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 177 · 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 wheel on ball bearings (b) a rough doormat (c) powder on a carrom board (d) oil on a squeaky hinge
2. 2.🛞 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 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
3. 3.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
4. 4.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
6. 6.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a tyre with deep treads (d) a wet tiled floor
7. 7.True or false: a rough doormat gives less friction. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) oil on a squeaky hinge (d) chalk on a gym bar
9. 9.True or false: oil on a squeaky hinge 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) powder on a carrom board (d) sand on a slippery path
11. 11.🛞 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 13 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
12. 12.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
14. 14.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
15. 15.🛞 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 wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wheel on ball bearings (d) chalk on a gym bar
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
20. 20.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
24. 24.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
26. 26.True or false: sand on a slippery path gives less friction. (a) False (b) True
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 10 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
38. 38.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
39. 39.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 2 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet

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