Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 988 · 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.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
2. 2.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
3. 3.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 9 N, a carpet 12 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
5. 5.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
7. 7.🛞 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. How many newtons more were needed on sandpaper than on ice?
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wheel on ball bearings (d) chalk on a gym bar
9. 9.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a wheel on ball bearings (d) sand on a slippery path
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a rough doormat (d) a tyre with deep treads
11. 11.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
15. 15.True or false: a wet tiled floor gives more friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
17. 17.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
18. 18.True or false: a box pushed on carpet gives less friction. (a) True (b) False
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
21. 21.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a box pushed on carpet
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) oil on a squeaky hinge (d) a tyre with deep treads
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
24. 24.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a grippy rubber sole (d) a smooth steel slide
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 13 N, ice 3 N, a glass sheet 7 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
27. 27.True or false: skating on ice gives more friction. (a) True (b) False
28. 28.True or false: sand on a slippery path gives more friction. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a box pushed on carpet (d) a smooth steel slide
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
33. 33.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
34. 34.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, sandpaper 11 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
38. 38.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
39. 39.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
40. 40.True or false: powder on a carrom board gives more friction. (a) False (b) True

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