Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 514 · 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 box pushed on carpet? (a) less friction (b) more friction
2. 2.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a rough doormat (d) powder on a carrom board
3. 3.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
4. 4.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a tyre with deep treads
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
8. 8.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
9. 9.True or false: a tyre with deep treads gives less friction. (a) True (b) False
10. 10.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a tyre with deep treads (d) a wet tiled floor
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
14. 14.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
15. 15.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a wet tiled floor (d) sand on a slippery path
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
18. 18.🛞 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 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
20. 20.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
23. 23.True or false: a grippy rubber sole gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
25. 25.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
27. 27.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) sand on a slippery path (d) a grippy rubber sole
28. 28.True or false: a rough doormat gives more friction. (a) False (b) True
29. 29.True or false: skating on ice gives less friction. (a) False (b) True
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.🛞 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 4 N, a carpet 6 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: a glass sheet 8 N, a wooden plank 10 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
35. 35.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a rough doormat (d) a box pushed on carpet
37. 37.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 10 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?

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