Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 286 · 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.🛞 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 wooden plank 6 N, sandpaper 9 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
2. 2.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
3. 3.🛞 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 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
4. 4.🔍 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 wet tiled floor
5. 5.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a wheel on ball bearings
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.True or false: a wet tiled floor gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
11. 11.True or false: a rough doormat gives more friction. (a) True (b) False
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a rough doormat (d) a wheel on ball bearings
16. 16.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
17. 17.🛞 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 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
19. 19.True or false: sand on a slippery path gives less friction. (a) True (b) False
20. 20.True or false: a tyre with deep treads gives less friction. (a) False (b) True
21. 21.🛞 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 wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
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 glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
23. 23.True or false: a box pushed on carpet gives less friction. (a) True (b) False
24. 24.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
25. 25.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) skating on ice (d) a box pushed on carpet
27. 27.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
29. 29.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a box pushed on carpet (d) powder on a carrom board
30. 30.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a grippy rubber sole (d) a tyre with deep treads
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
34. 34.True or false: sand on a slippery path gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
37. 37.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
38. 38.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
39. 39.🛞 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, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
40. 40.True or false: chalk on a gym bar gives less friction. (a) False (b) True

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