Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 483 · 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.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 4 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
3. 3.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
6. 6.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a smooth steel slide (d) skating on ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
9. 9.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) chalk on a gym bar (d) oil on a squeaky hinge
11. 11.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
12. 12.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a box pushed on carpet (d) sand on a slippery path
13. 13.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
14. 14.True or false: a tyre with deep treads gives more friction. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
17. 17.True or false: chalk on a gym bar gives less friction. (a) True (b) False
18. 18.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
20. 20.True or false: powder on a carrom board gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
24. 24.🛞 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 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
26. 26.True or false: a rough doormat gives less friction. (a) True (b) False
27. 27.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
28. 28.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a box pushed on carpet (d) a wheel on ball bearings
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
35. 35.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
37. 37.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) sand on a slippery path (d) a wheel on ball bearings
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 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 6 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?

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