Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 191 · 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.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
2. 2.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) skating on ice
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.True or false: chalk on a gym bar gives more friction. (a) False (b) True
5. 5.🛞 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 carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
11. 11.🛞 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 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
12. 12.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) powder on a carrom board (d) chalk on a gym bar
13. 13.True or false: a box pushed on carpet gives more friction. (a) True (b) False
14. 14.True or false: a smooth steel slide gives less friction. (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) oil on a squeaky hinge (d) skating on ice
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.True or false: skating on ice gives more friction. (a) True (b) False
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a box pushed on carpet (d) sand on a slippery path
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) sand on a slippery path (d) a grippy rubber sole
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
28. 28.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a rough doormat
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
31. 31.True or false: skating on ice gives less friction. (a) True (b) False
32. 32.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
33. 33.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
34. 34.🛞 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, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
37. 37.True or false: a grippy rubber sole gives more friction. (a) False (b) True
38. 38.True or false: sand on a slippery path gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
40. 40.🛞 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) sandpaper (b) a glass sheet (c) ice (d) a carpet

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