Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 381 · 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 grip the road (b) to look nice (c) to save rubber (d) to go slower
2. 2.True or false: a grippy rubber sole gives less friction. (a) False (b) True
3. 3.True or false: a rough doormat gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) a smooth steel slide
7. 7.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
8. 8.True or false: powder on a carrom board gives less friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a grippy rubber sole (d) skating on ice
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
12. 12.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
13. 13.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
14. 14.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
15. 15.🛞 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, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
16. 16.🛞 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. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
18. 18.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a box pushed on carpet
19. 19.True or false: a grippy rubber sole gives more friction. (a) False (b) True
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 12 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) chalk on a gym bar (d) a box pushed on carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 15 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
27. 27.True or false: a smooth steel slide gives less friction. (a) False (b) True
28. 28.True or false: sand on a slippery path gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
31. 31.True or false: a wet tiled floor gives more friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a wheel on ball bearings
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
35. 35.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
36. 36.True or false: a box pushed on carpet gives less friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
39. 39.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?

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