Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 464 · 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: a knot holding a rope? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
4. 4.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
5. 5.True or false: a wet tiled floor gives less friction. (a) True (b) False
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
9. 9.🛞 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 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
16. 16.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a smooth steel slide (d) a rough doormat
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) oil on a squeaky hinge (d) a tyre with deep treads
18. 18.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) powder on a carrom board (d) a rough doormat
20. 20.True or false: powder on a carrom board gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a grippy rubber sole (d) skating on ice
22. 22.True or false: a grippy rubber sole gives less friction. (a) True (b) False
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
24. 24.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
25. 25.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
26. 26.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
27. 27.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
28. 28.🛞 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 carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
29. 29.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a grippy rubber sole (d) skating on ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 16 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
32. 32.True or false: a tyre with deep treads gives less friction. (a) False (b) True
33. 33.🛞 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 wooden plank 6 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) powder on a carrom board (d) chalk on a gym bar
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) chalk on a gym bar (d) skating on ice
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
38. 38.True or false: a rough doormat gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
40. 40.🛞 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, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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