Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 67 · 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.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
3. 3.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.True or false: a grippy rubber sole gives less friction. (a) False (b) True
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a rough doormat
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
14. 14.🛞 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, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
16. 16.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) a wheel on ball bearings
18. 18.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
21. 21.True or false: a wet tiled floor gives less friction. (a) True (b) False
22. 22.True or false: sand on a slippery path gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 12 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 12 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
25. 25.True or false: a tyre with deep treads gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
28. 28.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a grippy rubber sole (d) sand on a slippery path
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
31. 31.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
32. 32.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
33. 33.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 11 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) chalk on a gym bar (d) a wet tiled floor
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
39. 39.True or false: a smooth steel slide gives more friction. (a) True (b) False
40. 40.True or false: a tyre with deep treads gives more friction. (a) True (b) False

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