Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 820 · 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.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
3. 3.🔍 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
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a box pushed on carpet (d) a smooth steel slide
5. 5.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
6. 6.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
8. 8.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
9. 9.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a tyre with deep treads (d) sand on a slippery path
12. 12.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
13. 13.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) oil on a squeaky hinge (d) a wheel on ball bearings
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a grippy rubber sole (d) a wet tiled floor
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
17. 17.🛞 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 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
19. 19.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.True or false: sand on a slippery path gives less friction. (a) False (b) True
22. 22.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
25. 25.True or false: sand on a slippery path gives more friction. (a) True (b) False
26. 26.True or false: a rough doormat gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
30. 30.True or false: skating on ice gives more friction. (a) False (b) True
31. 31.True or false: a grippy rubber sole gives less friction. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) a wheel on ball bearings
33. 33.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a smooth steel slide (d) a tyre with deep treads
34. 34.🛞 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 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
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 glass sheet 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet

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