Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 452 · 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.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a wet tiled floor (d) chalk on a gym bar
2. 2.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
3. 3.True or false: a tyre with deep treads gives more friction. (a) True (b) False
4. 4.True or false: chalk on a gym bar gives less friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
7. 7.🛞 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 carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a rough doormat (d) a tyre with deep treads
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a box pushed on carpet (d) skating on ice
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
19. 19.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) chalk on a gym bar (d) a rough doormat
21. 21.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
22. 22.True or false: a tyre with deep treads gives less friction. (a) True (b) False
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 9 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
25. 25.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
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 8 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
27. 27.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
30. 30.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
31. 31.True or false: a wet tiled floor gives more friction. (a) False (b) True
32. 32.True or false: a box pushed on carpet gives more friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a rough doormat (d) sand on a slippery path
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) skating on ice (d) sand on a slippery path
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
39. 39.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a wet tiled floor (d) a wheel on ball bearings

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