Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 266 · 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) powder on a carrom board (b) skating on ice (c) a tyre with deep treads (d) a wet tiled floor
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
3. 3.True or false: sand on a slippery path gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a wet tiled floor (d) a smooth steel slide
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
7. 7.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
8. 8.True or false: a smooth steel slide gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) chalk on a gym bar (d) oil on a squeaky hinge
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
15. 15.True or false: skating on ice gives more friction. (a) True (b) False
16. 16.🛞 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 10 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
22. 22.True or false: a smooth steel slide gives less friction. (a) True (b) False
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a rough doormat (d) a wheel on ball bearings
25. 25.True or false: skating on ice gives less friction. (a) False (b) True
26. 26.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
27. 27.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
29. 29.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
30. 30.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
31. 31.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
32. 32.True or false: a rough doormat gives more friction. (a) False (b) True
33. 33.True or false: a rough doormat gives less friction. (a) False (b) True
34. 34.🛞 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, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
37. 37.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) sand on a slippery path (d) powder on a carrom board
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank

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