Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 656 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
3. 3.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 12 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a tyre with deep treads (d) sand on a slippery path
10. 10.True or false: a grippy rubber sole gives less friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
13. 13.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (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 carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
16. 16.True or false: powder on a carrom board gives more friction. (a) False (b) True
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
18. 18.True or false: skating on ice gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.True or false: a smooth steel slide gives less friction. (a) False (b) True
22. 22.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
23. 23.🛞 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 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
24. 24.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
25. 25.True or false: a wet tiled floor gives more friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
29. 29.True or false: a tyre with deep treads gives more friction. (a) False (b) True
30. 30.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
31. 31.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
32. 32.🔍 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 rough doormat
33. 33.True or false: a box pushed on carpet gives less friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a wheel on ball bearings (d) skating on ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.True or false: chalk on a gym bar gives more friction. (a) False (b) True
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
40. 40.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a tyre with deep treads (d) a box pushed on carpet

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