Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 230 · 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: a carpet 7 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 12 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a smooth steel slide (d) a tyre with deep treads
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a smooth steel slide (d) a rough doormat
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 12 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
9. 9.True or false: a box pushed on carpet gives more friction. (a) False (b) True
10. 10.True or false: a smooth steel slide gives more friction. (a) True (b) False
11. 11.True or false: a wet tiled floor gives more friction. (a) True (b) False
12. 12.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
13. 13.True or false: chalk on a gym bar gives less friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 9 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
15. 15.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
16. 16.True or false: a grippy rubber sole gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a box pushed on carpet (d) a wet tiled floor
18. 18.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
19. 19.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
20. 20.True or false: oil on a squeaky hinge 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: a wooden plank 6 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
23. 23.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a rough doormat (d) powder on a carrom board
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
28. 28.True or false: a tyre with deep treads gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
30. 30.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
31. 31.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
32. 32.🛞 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 5 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
33. 33.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
34. 34.🛞 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, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
35. 35.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
37. 37.🛞 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 8 N, a wooden plank 12 N. How many newtons more were needed on a carpet than on ice?
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) skating on ice (d) a rough doormat
39. 39.🛞 More or less friction: powder on a carrom board? (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 7 N, a carpet 11 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet

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