Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 674 · 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 grippy rubber sole gives less friction. (a) True (b) False
2. 2.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) a wheel on ball bearings
5. 5.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
6. 6.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
8. 8.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
12. 12.True or false: sand on a slippery path gives more friction. (a) False (b) True
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wet tiled floor (d) powder on a carrom board
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
23. 23.🛞 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 7 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 2 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
25. 25.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
26. 26.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a grippy rubber sole (d) sand on a slippery path
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
30. 30.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) skating on ice (d) powder on a carrom board
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
33. 33.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a smooth steel slide (d) a grippy rubber sole
34. 34.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
35. 35.🛞 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 13 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
38. 38.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.True or false: a box pushed on carpet gives more friction. (a) True (b) False

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