Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 352 · 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 tyre with deep treads gives less friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) skating on ice (d) powder on a carrom board
3. 3.🛞 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 3 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
4. 4.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
5. 5.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
7. 7.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) chalk on a gym bar (d) a rough doormat
8. 8.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a rough doormat (d) a grippy rubber sole
10. 10.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
13. 13.True or false: a rough doormat gives less friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
16. 16.🛞 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 wooden plank 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
17. 17.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
18. 18.True or false: a tyre with deep treads gives more friction. (a) False (b) True
19. 19.True or false: powder on a carrom board gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
22. 22.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) skating on ice
24. 24.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: a box pushed on carpet gives more friction. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) powder on a carrom board
28. 28.🛞 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, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
31. 31.True or false: skating on ice gives less friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.True or false: sand on a slippery path gives more friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
35. 35.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a box pushed on carpet
37. 37.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.🛞 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) ice (b) a carpet (c) a wooden plank (d) sandpaper

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