Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 75 · 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 wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) sand on a slippery path
2. 2.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a grippy rubber sole (d) a smooth steel slide
3. 3.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
4. 4.True or false: a tyre with deep treads gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a rough doormat (d) sand on a slippery path
7. 7.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wheel on ball bearings (d) a tyre with deep treads
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) chalk on a gym bar (d) skating on ice
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) powder on a carrom board
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
12. 12.True or false: a wet tiled floor gives more friction. (a) True (b) False
13. 13.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
14. 14.True or false: sand on a slippery path gives less friction. (a) True (b) False
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🛞 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 6 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
17. 17.True or false: skating on ice gives more friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.True or false: a grippy rubber sole gives less friction. (a) True (b) False
20. 20.True or false: a tyre with deep treads gives more friction. (a) True (b) False
21. 21.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
22. 22.🛞 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 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
23. 23.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
27. 27.True or false: a rough doormat gives more friction. (a) False (b) True
28. 28.True or false: powder on a carrom board gives more friction. (a) False (b) True
29. 29.True or false: a box pushed on carpet gives less friction. (a) True (b) False
30. 30.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
32. 32.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
35. 35.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
38. 38.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
39. 39.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
40. 40.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem

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