Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 112 · 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: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
2. 2.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) chalk on a gym bar (d) a grippy rubber sole
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
9. 9.True or false: a smooth steel slide gives more friction. (a) False (b) True
10. 10.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
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 6 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
14. 14.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) powder on a carrom board (d) a grippy rubber sole
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
16. 16.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a box pushed on carpet
18. 18.True or false: a grippy rubber sole gives less friction. (a) True (b) False
19. 19.True or false: chalk on a gym bar gives less friction. (a) True (b) False
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
22. 22.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
27. 27.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
28. 28.True or false: a smooth steel slide gives less friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 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 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
32. 32.True or false: skating on ice gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
36. 36.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wet tiled floor
37. 37.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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