Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 127 · 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.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
4. 4.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
6. 6.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
7. 7.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
9. 9.True or false: a box pushed on carpet gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
12. 12.🛞 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 8 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.True or false: a tyre with deep treads gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
19. 19.🛞 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 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 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. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
22. 22.True or false: a rough doormat gives more friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) powder on a carrom board (d) chalk on a gym bar
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
26. 26.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
27. 27.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a grippy rubber sole (d) a box pushed on carpet
29. 29.True or false: a wet tiled floor gives more friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.True or false: sand on a slippery path gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) skating on ice (d) a wheel on ball bearings
36. 36.True or false: powder on a carrom board gives more friction. (a) False (b) True
37. 37.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful

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