Engineering Worksheet: Friction

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

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