Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 85 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
2. 2.🛞 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 2 N, a carpet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
5. 5.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
7. 7.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
8. 8.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
9. 9.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
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, a carpet 10 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
11. 11.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) a box pushed on carpet (d) a rough doormat
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 5 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
14. 14.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
15. 15.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
16. 16.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
17. 17.🛞 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 6 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) skating on ice (d) a wet tiled floor
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
20. 20.True or false: sand on a slippery path gives more friction. (a) True (b) False
21. 21.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
22. 22.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
23. 23.True or false: chalk on a gym bar gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) chalk on a gym bar
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
26. 26.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a smooth steel slide (d) a tyre with deep treads
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
29. 29.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: a smooth steel slide gives more friction. (a) False (b) True
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
37. 37.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful

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