Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 566 · 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.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
5. 5.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
6. 6.True or false: sand on a slippery path gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) oil on a squeaky hinge (d) a rough doormat
11. 11.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
14. 14.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) sand on a slippery path (d) powder on a carrom board
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
17. 17.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
18. 18.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
19. 19.🛞 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 carpet 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a tyre with deep treads (d) a grippy rubber sole
21. 21.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
24. 24.True or false: skating on ice gives more friction. (a) True (b) False
25. 25.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
26. 26.True or false: a grippy rubber sole gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
28. 28.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
33. 33.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
40. 40.True or false: a rough doormat gives less friction. (a) False (b) True

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