Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 782 · 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 9 N, ice 4 N, a glass sheet 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
4. 4.True or false: a smooth steel slide gives more friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
7. 7.🛞 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 wooden plank 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
8. 8.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
9. 9.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a wet tiled floor (d) a tyre with deep treads
11. 11.True or false: skating on ice gives less friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
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 2 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
15. 15.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
16. 16.True or false: a wet tiled floor gives more friction. (a) True (b) False
17. 17.True or false: skating on ice gives more friction. (a) False (b) True
18. 18.True or false: sand on a slippery path gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
20. 20.True or false: powder on a carrom board gives less friction. (a) True (b) False
21. 21.True or false: chalk on a gym bar gives less friction. (a) False (b) True
22. 22.🛞 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 3 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
23. 23.True or false: a wet tiled floor gives less friction. (a) False (b) True
24. 24.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
25. 25.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) skating on ice (d) sand on a slippery path
30. 30.True or false: a smooth steel slide gives less friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
32. 32.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a wheel on ball bearings
33. 33.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
34. 34.True or false: a box pushed on carpet gives more friction. (a) True (b) False
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.🛞 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, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
39. 39.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a tyre with deep treads (d) powder on a carrom board
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice

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