Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 968 · 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 4 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a grippy rubber sole (d) a box pushed on carpet
3. 3.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
4. 4.True or false: a rough doormat gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
7. 7.🛞 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 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 5 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
12. 12.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) sand on a slippery path (d) a grippy rubber sole
18. 18.🛞 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 wooden plank 6 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
19. 19.True or false: a wet tiled floor gives more friction. (a) True (b) False
20. 20.True or false: sand on a slippery path gives less friction. (a) True (b) False
21. 21.🛞 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, ice 1 N. How many newtons more were needed on a carpet than on ice?
22. 22.True or false: chalk on a gym bar gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, ice 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
28. 28.True or false: skating on ice gives more friction. (a) True (b) False
29. 29.True or false: sand on a slippery path gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
37. 37.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
38. 38.True or false: a wet tiled floor gives less friction. (a) False (b) True
39. 39.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a tyre with deep treads (d) sand on a slippery path

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