Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 338 · 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 rough doormat gives more friction. (a) True (b) False
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
3. 3.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a wheel on ball bearings (d) a rough doormat
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a wet tiled floor (d) a smooth steel slide
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a rough doormat (d) chalk on a gym bar
8. 8.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
9. 9.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
10. 10.True or false: powder on a carrom board gives less friction. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a wet tiled floor (d) skating on ice
12. 12.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.True or false: skating on ice gives more friction. (a) True (b) False
17. 17.True or false: a wet tiled floor gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
19. 19.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a smooth steel slide (d) skating on ice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
21. 21.True or false: sand on a slippery path gives more friction. (a) True (b) False
22. 22.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) oil on a squeaky hinge
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
28. 28.🛞 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, sandpaper 12 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
29. 29.True or false: a grippy rubber sole gives more friction. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a wet tiled floor (d) a rough doormat
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
34. 34.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 15 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
37. 37.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 6 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet

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