Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 539 · 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.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
2. 2.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
6. 6.🛞 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 3 N, a carpet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
7. 7.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a smooth steel slide (d) a tyre with deep treads
8. 8.True or false: chalk on a gym bar gives more friction. (a) False (b) True
9. 9.True or false: a rough doormat gives more friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
14. 14.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
16. 16.True or false: a box pushed on carpet gives more friction. (a) False (b) True
17. 17.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) oil on a squeaky hinge
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
21. 21.True or false: a rough doormat gives less friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
25. 25.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
26. 26.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
27. 27.True or false: a wet tiled floor gives more friction. (a) False (b) True
28. 28.🛞 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, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
34. 34.True or false: a grippy rubber sole gives more friction. (a) False (b) True
35. 35.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
36. 36.🛞 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 wooden plank 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a wet tiled floor (d) oil on a squeaky hinge
39. 39.True or false: powder on a carrom board gives more friction. (a) True (b) False
40. 40.🛞 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 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?

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