Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 118 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
2. 2.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
3. 3.True or false: sand on a slippery path gives less friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wet tiled floor (d) chalk on a gym bar
5. 5.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
11. 11.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
12. 12.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) warm (d) wet
13. 13.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a wet tiled floor (d) a wheel on ball bearings
14. 14.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
15. 15.True or false: a smooth steel slide gives more friction. (a) False (b) True
16. 16.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
17. 17.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
18. 18.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wet tiled floor (d) a wheel on ball bearings
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) oil on a squeaky hinge (d) a tyre with deep treads
20. 20.True or false: skating on ice gives more friction. (a) True (b) False
21. 21.True or false: powder on a carrom board gives more friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
23. 23.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
25. 25.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
26. 26.🛞 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 5 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
28. 28.🛞 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. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
34. 34.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 14 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
40. 40.True or false: a grippy rubber sole gives less friction. (a) False (b) True

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