Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 374 · 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.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
2. 2.🛞 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, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
3. 3.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) sand on a slippery path (d) a wet tiled floor
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
6. 6.True or false: skating on ice gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a smooth steel slide (d) a box pushed on carpet
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
9. 9.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
10. 10.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a wheel on ball bearings (d) a smooth steel slide
12. 12.True or false: a box pushed on carpet gives less friction. (a) False (b) True
13. 13.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
14. 14.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
17. 17.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
19. 19.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
23. 23.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
25. 25.True or false: a tyre with deep treads gives less friction. (a) True (b) False
26. 26.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
30. 30.True or false: powder on a carrom board gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
32. 32.🛞 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 wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
33. 33.🛞 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 8 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
35. 35.🛞 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, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
37. 37.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
38. 38.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a rough doormat (d) a wheel on ball bearings
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
40. 40.True or false: a grippy rubber sole gives more friction. (a) False (b) True

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