Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 202 · 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: powder on a carrom board? (a) more friction (b) less friction
2. 2.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wheel on ball bearings (d) a rough doormat
4. 4.True or false: a box pushed on carpet gives less friction. (a) False (b) True
5. 5.True or false: a wet tiled floor gives more friction. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
11. 11.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) skating on ice (d) a tyre with deep treads
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wet tiled floor (d) a wheel on ball bearings
13. 13.True or false: powder on a carrom board gives more friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
15. 15.🛞 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 11 N, a carpet 13 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
16. 16.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
17. 17.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
18. 18.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
19. 19.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
28. 28.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a tyre with deep treads (d) a smooth steel slide
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
30. 30.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
31. 31.🛞 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 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
32. 32.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
33. 33.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
35. 35.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
37. 37.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a smooth steel slide (d) a grippy rubber sole
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
40. 40.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder

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