Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 826 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a smooth steel slide (d) a tyre with deep treads
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) sand on a slippery path (d) a wet tiled floor
7. 7.🛞 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 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
8. 8.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
9. 9.True or false: sand on a slippery path gives less friction. (a) True (b) False
10. 10.True or false: a box pushed on carpet gives less friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 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 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 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 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.True or false: a grippy rubber sole gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) skating on ice (d) a rough doormat
17. 17.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a rough doormat (d) a wet tiled floor
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, a carpet 13 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
20. 20.True or false: skating on ice gives more friction. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a wet tiled floor (d) a grippy rubber sole
22. 22.True or false: sand on a slippery path gives more friction. (a) True (b) False
23. 23.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
24. 24.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
25. 25.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
27. 27.True or false: a grippy rubber sole gives less friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 13 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: powder on a carrom board gives more friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) a smooth steel slide
36. 36.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
37. 37.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) powder on a carrom board (d) sand on a slippery path
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
40. 40.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction

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