Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 917 · 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: gripping a cricket bat? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
3. 3.🛞 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 6 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
6. 6.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
8. 8.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) powder on a carrom board (d) sand on a slippery path
11. 11.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
12. 12.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) powder on a carrom board (d) oil on a squeaky hinge
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
16. 16.True or false: a grippy rubber sole gives less friction. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
18. 18.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) oil on a squeaky hinge (d) a box pushed on carpet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) a wheel on ball bearings (d) skating on ice
21. 21.True or false: powder on a carrom board gives more friction. (a) False (b) True
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 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
24. 24.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a box pushed on carpet (d) skating on ice
25. 25.True or false: a rough doormat gives less friction. (a) False (b) True
26. 26.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
27. 27.🛞 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 8 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
29. 29.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
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, sandpaper 8 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
32. 32.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
33. 33.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 5 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
35. 35.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
37. 37.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
38. 38.🛞 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 12 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
39. 39.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
40. 40.True or false: powder on a carrom board gives less friction. (a) True (b) False

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