Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 724 · 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.🛞 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 wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
2. 2.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) chalk on a gym bar (d) oil on a squeaky hinge
3. 3.True or false: a rough doormat gives less friction. (a) False (b) True
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
7. 7.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
8. 8.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
11. 11.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
12. 12.🛞 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. How many newtons more were needed on a carpet than on ice?
13. 13.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
15. 15.🛞 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 4 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
20. 20.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
21. 21.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) powder on a carrom board (d) skating on ice
23. 23.True or false: chalk on a gym bar gives less friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) a grippy rubber sole (d) a box pushed on carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 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, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
33. 33.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
35. 35.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 10 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
38. 38.True or false: powder on a carrom board gives more friction. (a) False (b) True
39. 39.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
40. 40.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a box pushed on carpet

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