Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 301 · 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.🛞 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 carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
2. 2.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
3. 3.True or false: a rough doormat gives more friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) skating on ice (d) oil on a squeaky hinge
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
7. 7.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a grippy rubber sole (d) a wet tiled floor
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) powder on a carrom board (d) chalk on a gym bar
10. 10.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) powder on a carrom board (d) skating on ice
11. 11.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) sand on a slippery path (d) a tyre with deep treads
13. 13.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
14. 14.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
15. 15.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
17. 17.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
18. 18.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
20. 20.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
21. 21.True or false: powder on a carrom board 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 wooden plank 4 N, a carpet 7 N, sandpaper 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
24. 24.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 11 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
30. 30.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
31. 31.🛞 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 wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
32. 32.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
33. 33.True or false: sand on a slippery path gives more friction. (a) False (b) True
34. 34.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.True or false: a box pushed on carpet gives more friction. (a) True (b) False
37. 37.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet

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