Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 382 · 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: a rough doormat gives less friction. (a) True (b) False
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a tyre with deep treads (d) a grippy rubber sole
5. 5.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
10. 10.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
13. 13.True or false: sand on a slippery path gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
20. 20.True or false: chalk on a gym bar gives more friction. (a) False (b) True
21. 21.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) skating on ice (d) chalk on a gym bar
25. 25.True or false: a rough doormat gives more friction. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a rough doormat (d) a tyre with deep treads
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
28. 28.🛞 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 carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
30. 30.🛞 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 wooden plank 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
31. 31.🛞 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 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
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 carpet 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a smooth steel slide (d) powder on a carrom board
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
39. 39.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a grippy rubber sole (d) a box pushed on carpet
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful

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