Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 181 · 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.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
5. 5.True or false: a rough doormat gives less friction. (a) False (b) True
6. 6.🛞 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 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
7. 7.True or false: a tyre with deep treads gives less friction. (a) False (b) True
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) powder on a carrom board (d) oil on a squeaky hinge
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
12. 12.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
14. 14.True or false: skating on ice gives less friction. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) powder on a carrom board (d) sand on a slippery path
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
17. 17.True or false: a box pushed on carpet gives more friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) sand on a slippery path (d) oil on a squeaky hinge
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on a carpet than on ice?
22. 22.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 10 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a rough doormat (d) powder on a carrom board
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
26. 26.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) chalk on a gym bar (d) a tyre with deep treads
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a box pushed on carpet (d) sand on a slippery path
30. 30.True or false: a grippy rubber sole gives less friction. (a) True (b) False
31. 31.True or false: sand on a slippery path gives less friction. (a) False (b) True
32. 32.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a box pushed on carpet (d) oil on a squeaky hinge
34. 34.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
35. 35.True or false: a wet tiled floor gives more friction. (a) False (b) True
36. 36.True or false: a tyre with deep treads gives more friction. (a) True (b) False
37. 37.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
38. 38.🛞 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 9 N. How many newtons more were needed on sandpaper than on ice?
39. 39.True or false: a rough doormat gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet

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