Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 975 · 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 tyre with deep treads? (a) more friction (b) less friction
2. 2.True or false: powder on a carrom board gives less friction. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) oil on a squeaky hinge (d) a rough doormat
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
5. 5.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.🛞 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 wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
9. 9.🛞 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 6 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
11. 11.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a wheel on ball bearings (d) a grippy rubber sole
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) chalk on a gym bar (d) a tyre with deep treads
17. 17.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
18. 18.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
19. 19.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
20. 20.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) a grippy rubber sole (c) a rough doormat (d) a box pushed on carpet
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a tyre with deep treads
23. 23.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
24. 24.True or false: a wet tiled floor gives less friction. (a) True (b) False
25. 25.🛞 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 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
27. 27.True or false: a box pushed on carpet gives more friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) skating on ice (d) oil on a squeaky hinge
31. 31.True or false: sand on a slippery path 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: a glass sheet 3 N, a carpet 4 N, sandpaper 7 N, ice 2 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: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a grippy rubber sole (d) chalk on a gym bar
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
38. 38.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a wet tiled floor (d) a tyre with deep treads
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?

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