Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 604 · 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 tyre with deep treads (d) powder on a carrom board
2. 2.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
4. 4.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a grippy rubber sole (d) sand on a slippery path
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.True or false: skating on ice gives less friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a box pushed on carpet (d) a grippy rubber sole
10. 10.True or false: a grippy rubber sole gives less friction. (a) True (b) False
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
13. 13.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wet tiled floor
15. 15.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
18. 18.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
19. 19.🛞 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 4 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
21. 21.🛞 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 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
23. 23.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, sandpaper 7 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
25. 25.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
26. 26.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
31. 31.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a rough doormat (d) powder on a carrom board
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
37. 37.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
40. 40.True or false: a smooth steel slide gives less friction. (a) False (b) True

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