Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 865 · 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.True or false: powder on a carrom board gives more friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) skating on ice (d) a grippy rubber sole
3. 3.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
4. 4.True or false: a grippy rubber sole gives more friction. (a) False (b) True
5. 5.True or false: skating on ice gives more friction. (a) True (b) False
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most 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: sandpaper 9 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) chalk on a gym bar (d) a grippy rubber sole
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 13 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
12. 12.True or false: a wet tiled floor gives more friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.True or false: chalk on a gym bar gives less friction. (a) False (b) True
17. 17.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
19. 19.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
20. 20.🛞 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 carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
21. 21.True or false: chalk on a gym bar gives more friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a grippy rubber sole (d) a tyre with deep treads
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) sand on a slippery path (d) a box pushed on carpet
27. 27.True or false: a box pushed on carpet gives more friction. (a) False (b) True
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: a rough doormat gives less friction. (a) True (b) False
30. 30.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
32. 32.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
33. 33.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
34. 34.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
35. 35.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
40. 40.🛞 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 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper

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