Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 998 · 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.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
2. 2.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
5. 5.True or false: a wet tiled floor gives more friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
7. 7.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a wet tiled floor (d) chalk on a gym bar
8. 8.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
11. 11.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a box pushed on carpet (d) sand on a slippery path
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
14. 14.True or false: a tyre with deep treads gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 15 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
17. 17.True or false: a rough doormat gives less friction. (a) True (b) False
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
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.True or false: a grippy rubber sole 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 carpet 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
22. 22.True or false: a box pushed on carpet gives more friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
24. 24.🛞 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 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.True or false: sand on a slippery path gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
28. 28.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
30. 30.True or false: a wet tiled floor gives less friction. (a) False (b) True
31. 31.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
33. 33.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
35. 35.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
36. 36.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
37. 37.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
39. 39.True or false: chalk on a gym bar gives more friction. (a) False (b) True
40. 40.🛞 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 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank

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