Engineering Worksheet: Friction

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

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