Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 147 · 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 grippy rubber sole (b) a box pushed on carpet (c) skating on ice (d) sand on a slippery path
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
9. 9.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
15. 15.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
16. 16.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a grippy rubber sole (d) a wheel on ball bearings
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
20. 20.True or false: a wet tiled floor gives less friction. (a) False (b) True
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
22. 22.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
25. 25.🛞 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 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a wooden plank 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
28. 28.True or false: a box pushed on carpet gives less friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) powder on a carrom board (d) chalk on a gym bar
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
35. 35.True or false: chalk on a gym bar gives more friction. (a) True (b) False
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) powder on a carrom board (d) skating on ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 7 N, a glass sheet 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper

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