Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 460 · 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 4 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
5. 5.True or false: a tyre with deep treads gives more friction. (a) False (b) True
6. 6.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
8. 8.True or false: a box pushed on carpet gives less friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
11. 11.True or false: chalk on a gym bar gives less friction. (a) False (b) True
12. 12.True or false: a wet tiled floor gives more friction. (a) True (b) False
13. 13.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a wet tiled floor (d) powder on a carrom board
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a grippy rubber sole (d) sand on a slippery path
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
22. 22.True or false: a smooth steel slide gives more friction. (a) False (b) True
23. 23.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
24. 24.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
25. 25.True or false: a grippy rubber sole gives less friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 15 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.True or false: a tyre with deep treads gives less friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a wet tiled floor (d) powder on a carrom board
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
34. 34.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
35. 35.True or false: chalk on a gym bar gives more friction. (a) False (b) True
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
37. 37.True or false: sand on a slippery path gives more friction. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) chalk on a gym bar (d) a wheel on ball bearings
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem

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