Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 939 · 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.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) skating on ice (d) oil on a squeaky hinge
2. 2.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) ice (d) sandpaper
5. 5.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
8. 8.True or false: powder on a carrom board gives more friction. (a) True (b) False
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
10. 10.True or false: a box pushed on carpet gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, ice 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings
14. 14.🛞 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, a carpet 12 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
15. 15.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
16. 16.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) a smooth steel slide
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wheel on ball bearings (d) a wet tiled floor
24. 24.🛞 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, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
28. 28.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) powder on a carrom board (d) a tyre with deep treads
29. 29.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
30. 30.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a rough doormat (d) chalk on a gym bar
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 3 N, a glass sheet 6 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: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
36. 36.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
38. 38.True or false: chalk on a gym bar gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful

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