Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 142 · 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: brakes stopping a cycle? (a) a problem (b) helpful
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
3. 3.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a box pushed on carpet (d) a grippy rubber sole
4. 4.True or false: a tyre with deep treads gives more friction. (a) False (b) True
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a smooth steel slide (d) a rough doormat
6. 6.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
7. 7.🛞 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, a carpet 10 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a tyre with deep treads (d) powder on a carrom board
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
11. 11.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
12. 12.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) sand on a slippery path (d) a wheel on ball bearings
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) skating on ice
16. 16.True or false: chalk on a gym bar gives less friction. (a) True (b) False
17. 17.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
18. 18.True or false: sand on a slippery path gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 6 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
24. 24.True or false: a grippy rubber sole gives more friction. (a) True (b) False
25. 25.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
27. 27.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
30. 30.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a box pushed on carpet (d) sand on a slippery path
31. 31.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
34. 34.True or false: a grippy rubber sole gives less friction. (a) False (b) True
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
39. 39.🛞 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 wooden plank 6 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice

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