Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 41 · 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: sand on a slippery path gives less friction. (a) False (b) True
2. 2.True or false: a grippy rubber sole gives less friction. (a) True (b) False
3. 3.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
6. 6.True or false: sand on a slippery path gives more friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a tyre with deep treads (d) a box pushed on carpet
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) oil on a squeaky hinge (d) a tyre with deep treads
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
13. 13.True or false: chalk on a gym bar gives more friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🛞 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 5 N, a wooden plank 9 N. How many newtons more were needed on a carpet than on ice?
16. 16.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
17. 17.🛞 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, sandpaper 9 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
18. 18.True or false: skating on ice gives more friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a smooth steel slide (d) powder on a carrom board
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
22. 22.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
23. 23.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) chalk on a gym bar (d) oil on a squeaky hinge
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
27. 27.🛞 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, a carpet 13 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
29. 29.🛞 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 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
30. 30.True or false: powder on a carrom board gives more friction. (a) True (b) False
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
32. 32.True or false: a smooth steel slide gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
34. 34.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 12 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
36. 36.🛞 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 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
37. 37.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) warm (d) magnetic
38. 38.🛞 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, a carpet 13 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem

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