Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 740 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
2. 2.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.True or false: sand on a slippery path gives less friction. (a) True (b) False
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
6. 6.True or false: a wet tiled floor gives less friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) a wet tiled floor
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) chalk on a gym bar (d) sand on a slippery path
12. 12.True or false: a grippy rubber sole gives less friction. (a) True (b) False
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
14. 14.True or false: powder on a carrom board gives more friction. (a) False (b) True
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
17. 17.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
18. 18.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a tyre with deep treads (d) a wheel on ball bearings
21. 21.True or false: a smooth steel slide gives more friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
23. 23.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
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 5 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
25. 25.🛞 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 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a box pushed on carpet gives more friction. (a) False (b) True
27. 27.True or false: chalk on a gym bar gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
32. 32.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a wheel on ball bearings (d) a tyre with deep treads
33. 33.True or false: a tyre with deep treads 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: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
35. 35.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
36. 36.True or false: a rough doormat gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
40. 40.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful

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