Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 620 · 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) oil on a squeaky hinge (b) a smooth steel slide (c) a wheel on ball bearings (d) a grippy rubber sole
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) chalk on a gym bar (d) a box pushed on carpet
3. 3.🔍 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
4. 4.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
5. 5.True or false: sand on a slippery path gives less friction. (a) False (b) True
6. 6.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
7. 7.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.True or false: sand on a slippery path gives more friction. (a) True (b) False
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
12. 12.True or false: a tyre with deep treads gives less friction. (a) True (b) False
13. 13.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
14. 14.True or false: a tyre with deep treads gives more friction. (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a wheel on ball bearings
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
20. 20.True or false: a wet tiled floor gives more friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) powder on a carrom board (d) a smooth steel slide
24. 24.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
25. 25.🛞 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 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
29. 29.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a grippy rubber sole (d) a box pushed on carpet
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a tyre with deep treads (d) skating on ice
31. 31.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
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 8 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.True or false: chalk on a gym bar gives less friction. (a) False (b) True
35. 35.🛞 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 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
40. 40.🛞 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 carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?

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