Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 799 · 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.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
3. 3.True or false: a grippy rubber sole gives more friction. (a) False (b) True
4. 4.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a grippy rubber sole (d) chalk on a gym bar
6. 6.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
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 8 N, a carpet 10 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
12. 12.True or false: sand on a slippery path gives less friction. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a smooth steel slide
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a wheel on ball bearings (d) oil on a squeaky hinge
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
19. 19.True or false: a tyre with deep treads gives less friction. (a) True (b) False
20. 20.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
26. 26.True or false: skating on ice gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) skating on ice (d) powder on a carrom board
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 7 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a smooth steel slide (d) oil on a squeaky hinge
34. 34.True or false: a rough doormat gives less friction. (a) False (b) True
35. 35.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a box pushed on carpet
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
38. 38.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a smooth steel slide? (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 10 N, sandpaper 14 N, ice 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet

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