Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 947 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
2. 2.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
3. 3.True or false: a box pushed on carpet gives more friction. (a) True (b) False
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) skating on ice (d) a rough doormat
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) oil on a squeaky hinge (d) chalk on a gym bar
13. 13.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
18. 18.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) powder on a carrom board (d) a smooth steel slide
20. 20.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
21. 21.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
22. 22.True or false: a smooth steel slide gives less friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) oil on a squeaky hinge (d) a wet tiled floor
24. 24.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
25. 25.🛞 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, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 3 N, a carpet 6 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: a wooden plank 5 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
28. 28.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a rough doormat (d) a tyre with deep treads
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
30. 30.True or false: chalk on a gym bar gives more friction. (a) False (b) True
31. 31.True or false: a smooth steel slide gives more friction. (a) False (b) True
32. 32.🛞 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. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
34. 34.🛞 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 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
35. 35.True or false: powder on a carrom board gives less friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) sand on a slippery path (d) chalk on a gym bar
37. 37.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) oil on a squeaky hinge (d) a wet tiled floor
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a tyre with deep treads? (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 wooden plank 8 N, a carpet 12 N, sandpaper 15 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice

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