Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 316 · 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.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 7 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
3. 3.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
4. 4.True or false: a tyre with deep treads gives less friction. (a) True (b) False
5. 5.True or false: skating on ice gives less friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
9. 9.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🛞 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 9 N, sandpaper 13 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
13. 13.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
14. 14.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) skating on ice (d) a box pushed on carpet
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a smooth steel slide (d) chalk on a gym bar
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
21. 21.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a tyre with deep treads (d) sand on a slippery path
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
26. 26.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
27. 27.True or false: powder on a carrom board gives less friction. (a) False (b) True
28. 28.🛞 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 carpet 4 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
29. 29.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
30. 30.True or false: sand on a slippery path gives more friction. (a) False (b) True
31. 31.🛞 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, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
32. 32.True or false: sand on a slippery path gives less friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
36. 36.True or false: a tyre with deep treads gives more friction. (a) False (b) True
37. 37.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
39. 39.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
40. 40.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction

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