Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 940 · 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: ice 1 N, a glass sheet 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
3. 3.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 8 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) skating on ice (d) a rough doormat
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
9. 9.True or false: a smooth steel slide gives more friction. (a) False (b) True
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 14 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
13. 13.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a box pushed on carpet (d) oil on a squeaky hinge
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) oil on a squeaky hinge (d) a rough doormat
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
21. 21.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
24. 24.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
25. 25.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
26. 26.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 3 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) a tyre with deep treads (d) chalk on a gym bar
29. 29.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: a tyre with deep treads gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
33. 33.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
34. 34.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) oil on a squeaky hinge (d) powder on a carrom board
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
37. 37.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
38. 38.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a smooth steel slide (d) sand on a slippery path
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
40. 40.🛞 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 13 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?

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