Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 12 · 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 more friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🛞 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 least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
4. 4.🛞 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 11 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
5. 5.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
7. 7.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
8. 8.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) oil on a squeaky hinge (d) chalk on a gym bar
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 8 N, sandpaper 12 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
13. 13.True or false: a wet tiled floor gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) oil on a squeaky hinge (d) a box pushed on carpet
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a rough doormat (d) skating on ice
17. 17.🛞 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 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) a grippy rubber sole
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
20. 20.🛞 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, a carpet 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.True or false: skating on ice gives less friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a smooth steel slide (d) a rough doormat
23. 23.True or false: powder on a carrom board gives more friction. (a) True (b) False
24. 24.True or false: a tyre with deep treads gives more friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
26. 26.🛞 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 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
28. 28.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a smooth steel slide (d) a rough doormat
30. 30.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
31. 31.True or false: sand on a slippery path 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 7 N, sandpaper 11 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a wet tiled floor (d) a wheel on ball bearings
34. 34.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
35. 35.True or false: a smooth steel slide gives less friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) chalk on a gym bar (d) a wet tiled floor
37. 37.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
38. 38.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
39. 39.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
40. 40.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) oil on a squeaky hinge (d) a smooth steel slide

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