Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 599 · 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 8 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) sand on a slippery path (d) skating on ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a smooth steel slide (d) a tyre with deep treads
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
7. 7.True or false: chalk on a gym bar gives more friction. (a) False (b) True
8. 8.🛞 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 11 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
9. 9.🛞 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, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
10. 10.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
11. 11.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
12. 12.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
14. 14.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
15. 15.True or false: powder on a carrom board gives more friction. (a) True (b) False
16. 16.True or false: skating on ice gives more friction. (a) True (b) False
17. 17.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.True or false: a grippy rubber sole gives less friction. (a) True (b) False
20. 20.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
21. 21.🛞 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 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) skating on ice (d) oil on a squeaky hinge
25. 25.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.🛞 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 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
31. 31.🛞 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 wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
33. 33.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a smooth steel slide (d) skating on ice
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
36. 36.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 8 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wet tiled floor (d) a smooth steel slide
39. 39.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
40. 40.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem

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