Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 40 · 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 wet tiled floor? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
3. 3.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
4. 4.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
5. 5.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
7. 7.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
10. 10.True or false: a rough doormat gives less friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) sand on a slippery path (d) skating on ice
13. 13.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) skating on ice (d) a rough doormat
14. 14.True or false: a wet tiled floor gives more friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a smooth steel slide (d) a rough doormat
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
19. 19.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
20. 20.True or false: a grippy rubber sole gives more friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
22. 22.True or false: chalk on a gym bar gives more friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) sand on a slippery path (d) a rough doormat
24. 24.🛞 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, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
25. 25.🛞 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 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a wet tiled floor (d) oil on a squeaky hinge
30. 30.True or false: a box pushed on carpet gives less friction. (a) True (b) False
31. 31.True or false: sand on a slippery path gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
33. 33.True or false: skating on ice gives less friction. (a) False (b) True
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
35. 35.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) skating on ice (d) a smooth steel slide
36. 36.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
39. 39.🛞 Is friction helpful or a problem here: walking without slipping? (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 7 N, a wooden plank 9 N, a carpet 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice

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