Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 44 · 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.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
7. 7.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
10. 10.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a wheel on ball bearings (d) a grippy rubber sole
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🛞 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 carpet 8 N. How many newtons more were needed on sandpaper than on ice?
15. 15.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
18. 18.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
20. 20.True or false: a smooth steel slide gives more friction. (a) False (b) True
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
23. 23.🛞 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 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
24. 24.True or false: powder on a carrom board gives more friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) skating on ice (d) a wheel on ball bearings
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
28. 28.True or false: a tyre with deep treads gives less friction. (a) False (b) True
29. 29.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a wet tiled floor (d) sand on a slippery path
33. 33.🛞 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 least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) powder on a carrom board (d) a wheel on ball bearings
35. 35.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
37. 37.🛞 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 wooden plank 9 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
40. 40.🛞 More or less friction: skating on ice? (a) less friction (b) more friction

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