Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 318 · 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.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a smooth steel slide (d) powder on a carrom board
3. 3.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
9. 9.True or false: skating on ice gives less friction. (a) False (b) True
10. 10.True or false: a wet tiled floor gives less friction. (a) False (b) True
11. 11.True or false: chalk on a gym bar gives less friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 7 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) sand on a slippery path (d) a grippy rubber sole
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a rough doormat (d) oil on a squeaky hinge
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
19. 19.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 16 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.True or false: a grippy rubber sole gives less friction. (a) False (b) True
23. 23.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
24. 24.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) chalk on a gym bar (d) a wheel on ball bearings
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 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 9 N, a carpet 12 N. How many newtons more were needed on a carpet than on ice?
28. 28.🔍 Which is the odd one out? (a) powder on a carrom board (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wheel on ball bearings
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) powder on a carrom board (d) a rough doormat
30. 30.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
34. 34.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
35. 35.True or false: chalk on a gym bar gives more friction. (a) False (b) True
36. 36.🛞 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 10 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
37. 37.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice

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