Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 500 · 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) a box pushed on carpet (d) a grippy rubber sole
2. 2.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board
3. 3.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
4. 4.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) skating on ice (d) sand on a slippery path
6. 6.True or false: chalk on a gym bar gives more friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.True or false: a rough doormat gives more friction. (a) False (b) True
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
10. 10.True or false: a grippy rubber sole gives more friction. (a) True (b) False
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
12. 12.True or false: a rough doormat gives less friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a tyre with deep treads (d) oil on a squeaky hinge
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
16. 16.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 2 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.True or false: a tyre with deep treads gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a tyre with deep treads (d) a wheel on ball bearings
21. 21.True or false: a wet tiled floor 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: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 13 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 13 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a wheel on ball bearings (d) a box pushed on carpet
26. 26.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
27. 27.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a wheel on ball bearings (d) a box pushed on carpet
29. 29.True or false: skating on ice gives less friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
31. 31.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
35. 35.🛞 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, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) chalk on a gym bar (d) powder on a carrom board
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful

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