Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 864 · 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.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) sand on a slippery path
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
7. 7.True or false: a rough doormat gives more friction. (a) True (b) False
8. 8.🛞 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 7 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) ice (d) polished marble
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) chalk on a gym bar (d) a rough doormat
11. 11.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
12. 12.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
15. 15.True or false: a smooth steel slide gives less friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) oil on a squeaky hinge (d) chalk on a gym bar
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) skating on ice (d) oil on a squeaky hinge
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
26. 26.🛞 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 9 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
27. 27.True or false: powder on a carrom board gives less friction. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a wet tiled floor (d) a box pushed on carpet
29. 29.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
30. 30.True or false: a wet tiled floor gives more friction. (a) False (b) True
31. 31.True or false: a tyre with deep treads 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 carpet 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a wet tiled floor
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
35. 35.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
36. 36.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wet tiled floor (d) a rough doormat
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
38. 38.True or false: a box pushed on carpet gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 11 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on a glass sheet?

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