Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 680 · 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.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, a carpet 14 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
3. 3.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
4. 4.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
6. 6.True or false: a smooth steel slide gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) chalk on a gym bar (d) skating on ice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a grippy rubber sole (d) a wheel on ball bearings
10. 10.True or false: a rough doormat gives less friction. (a) False (b) True
11. 11.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
13. 13.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a grippy rubber sole (d) a rough doormat
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a rough doormat (d) a grippy rubber sole
18. 18.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
19. 19.🛞 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. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
21. 21.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
22. 22.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a wheel on ball bearings (d) oil on a squeaky hinge
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.🛞 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 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
28. 28.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a box pushed on carpet (d) a wheel on ball bearings
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 7 N, sandpaper 8 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
31. 31.🛞 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, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
32. 32.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
33. 33.True or false: a box pushed on carpet gives less friction. (a) False (b) True
34. 34.True or false: a tyre with deep treads gives more friction. (a) False (b) True
35. 35.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
36. 36.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
38. 38.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only 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 1 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
40. 40.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction

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