Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 319 · 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.True or false: powder on a carrom board gives less friction. (a) True (b) False
2. 2.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
4. 4.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
8. 8.True or false: a tyre with deep treads gives more friction. (a) True (b) False
9. 9.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N, ice 3 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: sandpaper 13 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 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 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
18. 18.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
19. 19.True or false: oil on a squeaky hinge 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 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a rough doormat (d) powder on a carrom board
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
23. 23.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
27. 27.True or false: a rough doormat gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
29. 29.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
30. 30.🛞 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 least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
31. 31.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 11 N, sandpaper 13 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 6 N, a carpet 7 N, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 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 carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a rough doormat (d) a grippy rubber sole
36. 36.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a tyre with deep treads (d) chalk on a gym bar
37. 37.🛞 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 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
38. 38.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (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: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice

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