Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 378 · 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: oil on a squeaky hinge gives more friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
3. 3.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
4. 4.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
6. 6.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
10. 10.True or false: a tyre with deep treads gives more friction. (a) False (b) True
11. 11.True or false: a smooth steel slide gives less friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) oil on a squeaky hinge (d) powder on a carrom board
13. 13.🛞 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 wooden plank 8 N, a carpet 12 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a tyre with deep treads (d) a rough doormat
16. 16.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
17. 17.True or false: a rough doormat gives more friction. (a) False (b) True
18. 18.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a wet tiled floor (d) a grippy rubber sole
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
22. 22.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
25. 25.True or false: powder on a carrom board gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: a grippy rubber sole 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: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wet tiled floor (d) oil on a squeaky hinge
31. 31.🛞 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 wooden plank 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
32. 32.🛞 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 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
33. 33.🛞 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 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) 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 wooden plank 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
36. 36.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
37. 37.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
38. 38.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) sand on a slippery path (d) a smooth steel slide
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole

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