Engineering Worksheet: Friction

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

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