Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 390 · 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 more friction. (a) True (b) False
2. 2.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
6. 6.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a wet tiled floor
7. 7.True or false: chalk on a gym bar gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
9. 9.True or false: a wet tiled floor gives more friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) skating on ice
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 7 N, a carpet 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.🛞 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 10 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 10 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
23. 23.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
25. 25.True or false: sand on a slippery path gives more friction. (a) False (b) True
26. 26.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
27. 27.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
30. 30.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
35. 35.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
36. 36.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
37. 37.True or false: a smooth steel slide gives less friction. (a) True (b) False
38. 38.True or false: a tyre with deep treads gives less friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) powder on a carrom board (d) a grippy rubber sole
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper

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