Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 285 · 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: brakes stopping a cycle? (a) helpful (b) a problem
2. 2.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
4. 4.True or false: sand on a slippery path gives less friction. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) sand on a slippery path (d) skating on ice
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a box pushed on carpet
8. 8.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 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 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
13. 13.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
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: powder on a carrom board? (a) less friction (b) more friction
16. 16.True or false: a wet tiled floor gives more friction. (a) True (b) False
17. 17.True or false: a smooth steel slide gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, a carpet 13 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
20. 20.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
22. 22.True or false: a rough doormat gives more friction. (a) True (b) False
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
24. 24.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
25. 25.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
29. 29.🛞 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 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a wheel on ball bearings (d) a tyre with deep treads
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) powder on a carrom board (d) a tyre with deep treads
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) chalk on a gym bar (d) a tyre with deep treads
36. 36.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
37. 37.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, ice 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
39. 39.True or false: a tyre with deep treads gives more friction. (a) False (b) True
40. 40.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction

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