Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 405 · 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.True or false: a wet tiled floor gives more friction. (a) True (b) False
2. 2.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a rough doormat (d) a smooth steel slide
4. 4.True or false: a box pushed on carpet gives less friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
8. 8.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) skating on ice
9. 9.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 6 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
11. 11.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) a wet tiled floor (d) skating on ice
12. 12.True or false: chalk on a gym bar gives less friction. (a) False (b) True
13. 13.True or false: skating on ice gives more friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) sand on a slippery path
15. 15.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a box pushed on carpet (d) sand on a slippery path
19. 19.True or false: skating on ice gives less friction. (a) True (b) False
20. 20.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
21. 21.🛞 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 wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
22. 22.🛞 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, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
26. 26.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a smooth steel slide (c) a tyre with deep treads (d) chalk on a gym bar
27. 27.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
29. 29.True or false: powder on a carrom board gives less friction. (a) False (b) True
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a rough doormat (d) skating on ice
32. 32.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
33. 33.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
35. 35.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?

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