Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 753 · 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: a rough doormat gives more friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a wet tiled floor (d) chalk on a gym bar
3. 3.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) chalk on a gym bar (d) oil on a squeaky hinge
4. 4.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
5. 5.🛞 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, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
11. 11.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
12. 12.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
14. 14.🛞 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 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
16. 16.True or false: sand on a slippery path gives less friction. (a) True (b) False
17. 17.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
18. 18.🛞 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 15 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
22. 22.True or false: powder on a carrom board gives less friction. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) skating on ice (d) sand on a slippery path
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) chalk on a gym bar (d) sand on a slippery path
25. 25.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
26. 26.True or false: sand on a slippery path gives more friction. (a) True (b) False
27. 27.True or false: a rough doormat gives less friction. (a) False (b) True
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a wet tiled floor (d) a grippy rubber sole
30. 30.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
31. 31.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
32. 32.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
35. 35.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) chalk on a gym bar (d) a grippy rubber sole
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.🛞 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 wooden plank 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction

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