Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 718 · 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: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
5. 5.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
6. 6.True or false: a wet tiled floor gives more friction. (a) False (b) True
7. 7.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
9. 9.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
10. 10.🛞 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, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
11. 11.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
12. 12.🛞 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 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
13. 13.True or false: a rough doormat gives less friction. (a) True (b) False
14. 14.True or false: a grippy rubber sole gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
16. 16.True or false: sand on a slippery path gives more friction. (a) False (b) True
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
20. 20.True or false: a rough doormat gives more friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 5 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
22. 22.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
23. 23.True or false: powder on a carrom board gives less friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
25. 25.True or false: sand on a slippery path gives less friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a grippy rubber sole (d) powder on a carrom board
28. 28.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a grippy rubber sole (d) chalk on a gym bar
30. 30.True or false: a tyre with deep treads gives less friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
33. 33.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a grippy rubber sole (c) chalk on a gym bar (d) a box pushed on carpet
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a wet tiled floor
35. 35.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
36. 36.True or false: a tyre with deep treads gives more friction. (a) False (b) True
37. 37.True or false: powder on a carrom board gives more friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a rough doormat (d) a grippy rubber sole
39. 39.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
40. 40.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wheel on ball bearings (c) a wet tiled floor (d) chalk on a gym bar

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