Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 575 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
4. 4.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
5. 5.True or false: a grippy rubber sole gives less friction. (a) True (b) False
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
7. 7.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) oil on a squeaky hinge (d) a grippy rubber sole
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) sand on a slippery path (d) a tyre with deep treads
12. 12.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
13. 13.True or false: a box pushed on carpet gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
15. 15.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) skating on ice (d) sand on a slippery path
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a box pushed on carpet (d) a grippy rubber sole
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
19. 19.🛞 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 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
20. 20.True or false: a grippy rubber sole gives more friction. (a) False (b) True
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.True or false: a wet tiled floor gives more friction. (a) True (b) False
23. 23.🛞 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 11 N. How many newtons more were needed on sandpaper than on ice?
24. 24.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
25. 25.True or false: skating on ice gives less friction. (a) False (b) True
26. 26.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
27. 27.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) chalk on a gym bar (d) sand on a slippery path
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a tyre with deep treads (d) skating on ice
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) powder on a carrom board (d) a wheel on ball bearings
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
33. 33.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
34. 34.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
35. 35.🛞 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 2 N, a glass sheet 5 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 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a glass sheet 8 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 More or less friction: a wheel on ball bearings? (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 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet

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