Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 809 · 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: oil on a squeaky hinge gives more friction. (a) False (b) True
2. 2.True or false: skating on ice gives more friction. (a) True (b) False
3. 3.🔍 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
4. 4.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) sand on a slippery path (d) chalk on a gym bar
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a box pushed on carpet (d) a wet tiled floor
10. 10.🛞 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 6 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
11. 11.True or false: skating on ice gives less friction. (a) False (b) True
12. 12.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
13. 13.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
15. 15.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a tyre with deep treads (d) skating on ice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
17. 17.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
19. 19.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
25. 25.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) chalk on a gym bar (d) powder on a carrom board
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole
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 5 N, sandpaper 7 N, a glass sheet 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 5 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) skating on ice (d) a smooth steel slide
34. 34.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
35. 35.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a box pushed on carpet (d) a smooth steel slide
36. 36.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: a grippy rubber sole gives more friction. (a) False (b) True

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