Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 225 · 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: sand on a slippery path gives less friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) sand on a slippery path (d) oil on a squeaky hinge
5. 5.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🛞 More or less friction: a box pushed on carpet? (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 6 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 7 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
19. 19.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) skating on ice (d) oil on a squeaky hinge
21. 21.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a grippy rubber sole (d) a wheel on ball bearings
22. 22.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
23. 23.True or false: a grippy rubber sole gives more friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
25. 25.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
26. 26.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
27. 27.True or false: sand on a slippery path gives more friction. (a) False (b) True
28. 28.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
29. 29.True or false: a tyre with deep treads gives more friction. (a) True (b) False
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
34. 34.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
35. 35.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a grippy rubber sole (d) chalk on a gym bar
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
37. 37.True or false: a wet tiled floor gives more friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wet tiled floor (d) a box pushed on carpet
40. 40.🛞 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 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice

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