Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 414 · 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 wet tiled floor (b) a grippy rubber sole (c) a box pushed on carpet (d) sand on a slippery path
2. 2.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
3. 3.🛞 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 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.True or false: a wet tiled floor gives more friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wet tiled floor (d) sand on a slippery path
11. 11.True or false: sand on a slippery path gives less friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a smooth steel slide (d) a box pushed on carpet
14. 14.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a wheel on ball bearings (d) skating on ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
18. 18.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
23. 23.🛞 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 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.True or false: a tyre with deep treads gives more friction. (a) False (b) True
27. 27.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
28. 28.True or false: skating on ice gives more friction. (a) True (b) False
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.🛞 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 2 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 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 wooden plank 11 N, a carpet 15 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
37. 37.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) skating on ice (d) sand on a slippery path
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful

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