Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 800 · 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 grippy rubber sole gives more friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
7. 7.True or false: a rough doormat gives less friction. (a) True (b) False
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
9. 9.True or false: a wet tiled floor gives less friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
11. 11.True or false: a smooth steel slide gives less friction. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a smooth steel slide (d) sand on a slippery path
13. 13.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
16. 16.🛞 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, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
17. 17.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
19. 19.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) a tyre with deep treads
20. 20.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a box pushed on carpet (d) a grippy rubber sole
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
23. 23.🛞 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?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
26. 26.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
27. 27.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
28. 28.True or false: skating on ice gives less friction. (a) True (b) False
29. 29.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
30. 30.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
31. 31.True or false: chalk on a gym bar gives less friction. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a tyre with deep treads (d) a grippy rubber sole
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
34. 34.True or false: a grippy rubber sole gives less friction. (a) True (b) False
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.True or false: skating on ice gives more friction. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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