Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 511 · 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.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
4. 4.True or false: a tyre with deep treads gives less friction. (a) False (b) True
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
6. 6.True or false: a rough doormat gives more friction. (a) True (b) False
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
9. 9.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) sand on a slippery path (d) a tyre with deep treads
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 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 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
18. 18.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 13 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) oil on a squeaky hinge (d) a rough doormat
22. 22.True or false: chalk on a gym bar gives less friction. (a) False (b) True
23. 23.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
24. 24.True or false: a box pushed on carpet gives less friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a wheel on ball bearings (d) chalk on a gym bar
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
30. 30.🛞 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, sandpaper 12 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
33. 33.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) powder on a carrom board (d) skating on ice
36. 36.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
38. 38.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
39. 39.True or false: chalk on a gym bar gives more friction. (a) False (b) True
40. 40.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?

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