Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 218 · 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: chalk on a gym bar gives less friction. (a) True (b) False
2. 2.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
3. 3.True or false: a smooth steel slide gives more friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
5. 5.True or false: a box pushed on carpet gives less friction. (a) True (b) False
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
9. 9.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a grippy rubber sole (d) a wheel on ball bearings
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
12. 12.True or false: skating on ice gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
14. 14.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
15. 15.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
16. 16.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
17. 17.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (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) a box pushed on carpet (b) a smooth steel slide (c) sand on a slippery path (d) a tyre with deep treads
24. 24.🛞 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, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
25. 25.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 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, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
28. 28.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
34. 34.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 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, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
38. 38.True or false: chalk on a gym bar gives more friction. (a) True (b) False
39. 39.🛞 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, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction

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