Engineering Worksheet: Friction

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

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