Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 711 · 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.True or false: skating on ice gives more friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) skating on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
4. 4.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
7. 7.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
8. 8.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) skating on ice
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
14. 14.🛞 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, a carpet 8 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
15. 15.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
16. 16.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
17. 17.True or false: a grippy rubber sole gives more friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) powder on a carrom board (d) a rough doormat
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a box pushed on carpet (d) a wheel on ball bearings
20. 20.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
22. 22.True or false: powder on a carrom board gives less friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
25. 25.True or false: a tyre with deep treads gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🛞 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 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
28. 28.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.True or false: powder on a carrom board gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a rough doormat (d) a wheel on ball bearings
33. 33.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
37. 37.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
39. 39.True or false: skating on ice gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper

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