Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 652 · 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: skating on ice gives less friction. (a) True (b) False
2. 2.🛞 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 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) oil on a squeaky hinge (d) sand on a slippery path
4. 4.True or false: a tyre with deep treads gives more friction. (a) False (b) True
5. 5.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
8. 8.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
9. 9.True or false: sand on a slippery path gives less friction. (a) False (b) True
10. 10.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a box pushed on carpet (d) skating on ice
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
13. 13.True or false: chalk on a gym bar gives less friction. (a) False (b) True
14. 14.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
15. 15.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
16. 16.🛞 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 7 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
18. 18.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a tyre with deep treads (d) a rough doormat
19. 19.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
20. 20.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
22. 22.True or false: powder on a carrom board gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) chalk on a gym bar (d) oil on a squeaky hinge
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) sand on a slippery path (d) powder on a carrom board
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a rough doormat (d) a wheel on ball bearings
29. 29.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
30. 30.True or false: a wet tiled floor gives more friction. (a) True (b) False
31. 31.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 4 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
33. 33.🛞 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 carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
36. 36.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper

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