Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 777 · 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 10 N, sandpaper 13 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a rough doormat (d) a grippy rubber sole
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
6. 6.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a wheel on ball bearings (d) a grippy rubber sole
8. 8.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) sand on a slippery path (d) a smooth steel slide
13. 13.🛞 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 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
16. 16.True or false: powder on a carrom board gives more friction. (a) False (b) True
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
18. 18.🛞 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, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
22. 22.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
23. 23.True or false: skating on ice gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.True or false: sand on a slippery path gives more friction. (a) True (b) False
28. 28.True or false: a box pushed on carpet gives more friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 14 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
32. 32.🛞 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, sandpaper 13 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
35. 35.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 12 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
38. 38.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
39. 39.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
40. 40.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet

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