Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 9 · 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: a rough doormat? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
3. 3.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
7. 7.True or false: a rough doormat gives more friction. (a) False (b) True
8. 8.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
9. 9.True or false: a grippy rubber sole gives more friction. (a) True (b) False
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
11. 11.True or false: skating on ice gives more friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a tyre with deep treads (d) sand on a slippery path
13. 13.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
16. 16.🛞 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 8 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a grippy rubber sole (d) powder on a carrom board
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) powder on a carrom board (d) a wheel on ball bearings
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
23. 23.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a tyre with deep treads (d) powder on a carrom board
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) sand on a slippery path (d) a wheel on ball bearings
25. 25.🛞 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 wooden plank 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
27. 27.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
31. 31.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
32. 32.🛞 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 wooden plank 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.True or false: powder on a carrom board gives more friction. (a) False (b) True
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
37. 37.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a rough doormat (d) a box pushed on carpet
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
40. 40.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True

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