Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 65 · 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.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🛞 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 most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) chalk on a gym bar (d) sand on a slippery path
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
8. 8.True or false: a smooth steel slide gives less friction. (a) True (b) False
9. 9.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
13. 13.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) powder on a carrom board (d) a rough doormat
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) a wet tiled floor
17. 17.True or false: sand on a slippery path gives more friction. (a) True (b) False
18. 18.🛞 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 7 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) sand on a slippery path (d) a grippy rubber sole
23. 23.True or false: a wet tiled floor gives more friction. (a) True (b) False
24. 24.True or false: a grippy rubber sole gives more friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🛞 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 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) powder on a carrom board (d) sand on a slippery path
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) chalk on a gym bar
29. 29.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a smooth steel slide (d) a rough doormat
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) a wheel on ball bearings
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
32. 32.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
36. 36.🛞 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 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
39. 39.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
40. 40.🛞 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, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?

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