Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 764 · 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.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
2. 2.🛞 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 carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
3. 3.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
4. 4.True or false: a smooth steel slide gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
18. 18.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
19. 19.🛞 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 9 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
20. 20.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a grippy rubber sole (d) skating on ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a box pushed on carpet (d) sand on a slippery path
26. 26.True or false: powder on a carrom board gives less friction. (a) False (b) True
27. 27.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
28. 28.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) chalk on a gym bar (d) a wheel on ball bearings
29. 29.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
30. 30.🛞 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 9 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) sand on a slippery path (d) a wet tiled floor
32. 32.True or false: chalk on a gym bar gives more friction. (a) True (b) False
33. 33.True or false: chalk on a gym bar gives less friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
35. 35.True or false: a wet tiled floor gives more friction. (a) False (b) True
36. 36.🛞 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 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
38. 38.True or false: a box pushed on carpet gives less friction. (a) False (b) True
39. 39.True or false: powder on a carrom board gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank

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