Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 707 · 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: a tyre with deep treads gives more friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a rough doormat (d) powder on a carrom board
3. 3.True or false: a wet tiled floor gives less friction. (a) False (b) True
4. 4.🛞 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 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
5. 5.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a wet tiled floor (d) powder on a carrom board
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.🛞 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 11 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
9. 9.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
10. 10.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
11. 11.True or false: powder on a carrom board gives less friction. (a) False (b) True
12. 12.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 11 N, a carpet 13 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
15. 15.True or false: a tyre with deep treads gives less friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
18. 18.True or false: chalk on a gym bar gives more friction. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) skating on ice
20. 20.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
22. 22.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
23. 23.True or false: a box pushed on carpet gives more friction. (a) False (b) True
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) chalk on a gym bar (d) a rough doormat
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
30. 30.True or false: sand on a slippery path gives more friction. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
33. 33.True or false: skating on ice gives less friction. (a) False (b) True
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a rough doormat (d) powder on a carrom board
37. 37.True or false: a smooth steel slide gives less friction. (a) True (b) False
38. 38.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
39. 39.🛞 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 9 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice

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