Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 423 · 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 smooth steel slide gives more friction. (a) False (b) True
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) oil on a squeaky hinge (d) a tyre with deep treads
4. 4.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) powder on a carrom board (d) a smooth steel slide
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 2 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
11. 11.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
17. 17.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
18. 18.🛞 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 wooden plank 5 N, a carpet 6 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: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 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 carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
21. 21.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 10 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
24. 24.🛞 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 wooden plank 10 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
25. 25.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
27. 27.True or false: a box pushed on carpet gives less friction. (a) True (b) False
28. 28.True or false: sand on a slippery path gives more friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
30. 30.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
31. 31.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
33. 33.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
34. 34.True or false: a box pushed on carpet gives more friction. (a) True (b) False
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem

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