Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 214 · 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: sandpaper 10 N, ice 2 N, a glass sheet 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
3. 3.🛞 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 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.True or false: a wet tiled floor gives more friction. (a) True (b) False
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
7. 7.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
9. 9.True or false: skating on ice gives more friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 14 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
12. 12.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
13. 13.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
16. 16.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a rough doormat (d) a wet tiled floor
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 10 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
19. 19.True or false: sand on a slippery path gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 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
21. 21.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a rough doormat (d) a wheel on ball bearings
22. 22.🛞 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, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.True or false: a box pushed on carpet gives less friction. (a) True (b) False
25. 25.True or false: powder on a carrom board gives more friction. (a) True (b) False
26. 26.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a box pushed on carpet (d) skating on ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
30. 30.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
32. 32.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
36. 36.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a box pushed on carpet (d) a wet tiled floor
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
39. 39.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank

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