Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 263 · 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.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
2. 2.True or false: powder on a carrom board gives less friction. (a) True (b) False
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a tyre with deep treads
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
9. 9.True or false: a smooth steel slide gives more friction. (a) False (b) True
10. 10.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
12. 12.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
15. 15.True or false: powder on a carrom board gives more friction. (a) True (b) False
16. 16.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
17. 17.True or false: a rough doormat gives more friction. (a) True (b) False
18. 18.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
21. 21.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) cold (d) warm
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) skating on ice (d) a wheel on ball bearings
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
25. 25.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
26. 26.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
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 8 N, a carpet 11 N, ice 4 N. How many newtons more were needed on a carpet than on ice?
28. 28.True or false: chalk on a gym bar gives less friction. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a box pushed on carpet (d) a rough doormat
30. 30.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
31. 31.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.True or false: skating on ice gives less friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
36. 36.True or false: a wet tiled floor gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
38. 38.True or false: a tyre with deep treads gives less friction. (a) True (b) False
39. 39.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?

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