Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 796 · 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: sandpaper 7 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.True or false: chalk on a gym bar gives less friction. (a) True (b) False
3. 3.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
4. 4.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a wet tiled floor (d) oil on a squeaky hinge
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
9. 9.🛞 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 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.🛞 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?
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
16. 16.True or false: a smooth steel slide gives less friction. (a) False (b) True
17. 17.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
18. 18.True or false: a smooth steel slide gives more friction. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 9 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a rough doormat (d) a box pushed on carpet
25. 25.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a smooth steel slide (d) a rough doormat
26. 26.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) powder on a carrom board (d) a grippy rubber sole
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 14 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
29. 29.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a rough doormat (d) chalk on a gym bar
31. 31.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a box pushed on carpet gives more friction. (a) False (b) True
34. 34.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (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: sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: a box pushed on carpet gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
39. 39.True or false: a tyre with deep treads gives less friction. (a) True (b) False
40. 40.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True

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