Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 759 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
2. 2.True or false: sand on a slippery path gives less friction. (a) True (b) False
3. 3.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
4. 4.True or false: skating on ice gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) oil on a squeaky hinge (d) a box pushed on carpet
8. 8.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
12. 12.True or false: a wet tiled floor gives less friction. (a) True (b) False
13. 13.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
16. 16.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) chalk on a gym bar (d) a wheel on ball bearings
18. 18.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a wet tiled floor (d) a wheel on ball bearings
21. 21.🛞 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 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
22. 22.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
23. 23.🛞 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, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
26. 26.True or false: a tyre with deep treads gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 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 carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
35. 35.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
36. 36.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
39. 39.🛞 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, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) powder on a carrom board (d) a rough doormat

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