Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 420 · 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.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a smooth steel slide (d) a tyre with deep treads
2. 2.True or false: a box pushed on carpet gives less friction. (a) True (b) False
3. 3.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
5. 5.🛞 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, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
6. 6.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a grippy rubber sole (d) a rough doormat
9. 9.🛞 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, sandpaper 13 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
10. 10.True or false: a wet tiled floor gives more friction. (a) True (b) False
11. 11.🛞 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. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
12. 12.🛞 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 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a tyre with deep treads (d) chalk on a gym bar
17. 17.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a wet tiled floor (d) chalk on a gym bar
19. 19.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
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 3 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a rough doormat (d) powder on a carrom board
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 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, ice 4 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 10 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) a smooth steel slide (d) powder on a carrom board
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
32. 32.True or false: a rough doormat gives less friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) chalk on a gym bar (d) sand on a slippery path
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) chalk on a gym bar (d) a smooth steel slide
38. 38.True or false: sand on a slippery path gives less friction. (a) True (b) False
39. 39.True or false: skating on ice gives less friction. (a) False (b) True
40. 40.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction

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