Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 360 · 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 wheel on ball bearings gives less friction. (a) True (b) False
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) skating on ice (d) sand on a slippery path
4. 4.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a wheel on ball bearings (d) a grippy rubber sole
7. 7.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
8. 8.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
9. 9.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) sand on a slippery path (d) a wheel on ball bearings
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
13. 13.True or false: a box pushed on carpet gives less friction. (a) True (b) False
14. 14.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) sand on a slippery path (d) chalk on a gym bar
18. 18.True or false: a smooth steel slide gives more friction. (a) False (b) True
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) a box pushed on carpet
21. 21.True or false: a wet tiled floor gives less friction. (a) True (b) False
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: a tyre with deep treads gives more friction. (a) True (b) False
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
33. 33.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a grippy rubber sole (d) skating on ice
34. 34.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
35. 35.🛞 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 carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 12 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
40. 40.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower

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