Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 252 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
4. 4.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a smooth steel slide
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 7 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
9. 9.True or false: a box pushed on carpet gives less friction. (a) False (b) True
10. 10.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
11. 11.True or false: a wet tiled floor gives more friction. (a) True (b) False
12. 12.🛞 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, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
15. 15.True or false: oil on a squeaky hinge gives less 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 6 N, a carpet 10 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
17. 17.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
22. 22.True or false: a smooth steel slide gives less friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 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 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) powder on a carrom board (d) a smooth steel slide
29. 29.True or false: a grippy rubber sole gives less friction. (a) False (b) True
30. 30.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
34. 34.🔍 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
35. 35.True or false: a rough doormat gives less friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 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 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 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 carpet 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
40. 40.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful

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