Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 702 · 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) wet (b) warm (c) magnetic (d) cold
2. 2.True or false: a wet tiled floor gives more friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
5. 5.True or false: a rough doormat gives more friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
7. 7.True or false: a grippy rubber sole gives less friction. (a) True (b) False
8. 8.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a box pushed on carpet (d) a rough doormat
11. 11.True or false: a rough doormat gives less friction. (a) False (b) True
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
13. 13.🛞 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 10 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a tyre with deep treads (d) sand on a slippery path
17. 17.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
18. 18.True or false: chalk on a gym bar gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) skating on ice (d) a box pushed on carpet
21. 21.True or false: sand on a slippery path gives less friction. (a) True (b) False
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
23. 23.🛞 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 5 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
24. 24.🛞 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 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
25. 25.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 15 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
27. 27.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
29. 29.🛞 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 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.True or false: a tyre with deep treads gives less friction. (a) True (b) False
33. 33.True or false: skating on ice gives more friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 8 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a wet tiled floor (d) a rough doormat
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
39. 39.🛞 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 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) oil on a squeaky hinge (d) powder on a carrom board

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