Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 81 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
3. 3.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
4. 4.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
5. 5.True or false: chalk on a gym bar gives more friction. (a) False (b) True
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
9. 9.🛞 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 most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
10. 10.🛞 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 3 N, sandpaper 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
11. 11.🛞 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 7 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
12. 12.True or false: a box pushed on carpet gives less friction. (a) True (b) False
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
14. 14.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
15. 15.True or false: powder on a carrom board gives less friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a wet tiled floor (d) a grippy rubber sole
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
21. 21.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
22. 22.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
23. 23.🛞 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 7 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
24. 24.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
27. 27.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
28. 28.🛞 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 11 N, a carpet 13 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
29. 29.True or false: sand on a slippery path gives less friction. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a wet tiled floor (d) a grippy rubber sole
31. 31.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.True or false: a wet tiled floor gives more friction. (a) False (b) True
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
36. 36.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
37. 37.True or false: a grippy rubber sole gives less friction. (a) True (b) False
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.🛞 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, ice 1 N, a glass sheet 2 N. How many newtons more were needed on a carpet than on ice?

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