Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 824 · 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.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
2. 2.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
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 3 N, a carpet 4 N, sandpaper 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
4. 4.🛞 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, sandpaper 9 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
6. 6.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a smooth steel slide (d) a rough doormat
9. 9.True or false: a wet tiled floor gives more friction. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a rough doormat (d) powder on a carrom board
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
12. 12.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a rough doormat (d) a box pushed on carpet
13. 13.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a wet tiled floor (d) sand on a slippery path
15. 15.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
20. 20.True or false: sand on a slippery path gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
23. 23.True or false: powder on a carrom board gives more friction. (a) False (b) True
24. 24.True or false: a rough doormat gives less friction. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a grippy rubber sole (d) sand on a slippery path
26. 26.True or false: a box pushed on carpet gives less friction. (a) True (b) False
27. 27.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
29. 29.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
32. 32.True or false: chalk on a gym bar gives less friction. (a) False (b) True
33. 33.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
34. 34.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
36. 36.🛞 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 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
38. 38.True or false: a wet tiled floor gives less friction. (a) False (b) True
39. 39.True or false: a grippy rubber sole gives more friction. (a) True (b) False
40. 40.🛞 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 carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?

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