Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 317 · 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.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
4. 4.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
5. 5.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a tyre with deep treads (d) a wheel on ball bearings
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
10. 10.True or false: a grippy rubber sole gives more friction. (a) False (b) True
11. 11.🛞 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 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
16. 16.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) sand on a slippery path (d) a rough doormat
17. 17.True or false: sand on a slippery path gives less friction. (a) True (b) False
18. 18.True or false: skating on ice gives more friction. (a) True (b) False
19. 19.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
21. 21.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) sand on a slippery path (d) a wheel on ball bearings
23. 23.🛞 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 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
24. 24.True or false: a tyre with deep treads gives less friction. (a) False (b) True
25. 25.True or false: chalk on a gym bar gives less friction. (a) True (b) False
26. 26.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
27. 27.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
28. 28.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
29. 29.True or false: a box pushed on carpet gives more friction. (a) True (b) False
30. 30.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
32. 32.True or false: a wet tiled floor gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
35. 35.🛞 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, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 9 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) skating on ice (d) a wet tiled floor

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