Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 469 · 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 smooth steel slide? (a) less friction (b) more friction
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
3. 3.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
4. 4.🛞 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 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
8. 8.True or false: sand on a slippery path gives less friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
10. 10.True or false: a box pushed on carpet gives more friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
12. 12.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
13. 13.True or false: a grippy rubber sole gives more friction. (a) False (b) True
14. 14.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) powder on a carrom board (d) oil on a squeaky hinge
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
17. 17.🛞 More or less friction: powder on a carrom board? (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 wooden plank 6 N, a carpet 9 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) powder on a carrom board (d) a grippy rubber sole
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 12 N, sandpaper 16 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
23. 23.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
26. 26.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) sand on a slippery path (d) oil on a squeaky hinge
29. 29.🛞 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, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) a smooth steel slide
31. 31.🛞 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 6 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
37. 37.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) skating on ice (d) a grippy rubber sole
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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