Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 94 · 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: striking a matchstick? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
4. 4.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
5. 5.True or false: a smooth steel slide gives less friction. (a) True (b) False
6. 6.True or false: sand on a slippery path gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) powder on a carrom board (d) a wheel on ball bearings
10. 10.🛞 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 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
12. 12.True or false: a grippy rubber sole gives more friction. (a) True (b) False
13. 13.True or false: a rough doormat gives less friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
16. 16.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
17. 17.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a rough doormat (d) a tyre with deep treads
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, ice 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) chalk on a gym bar (d) a rough doormat
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
26. 26.True or false: sand on a slippery path gives more friction. (a) True (b) False
27. 27.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
29. 29.True or false: chalk on a gym bar gives more friction. (a) True (b) False
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
31. 31.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) a grippy rubber sole (d) a tyre with deep treads
33. 33.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
34. 34.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) powder on a carrom board (d) a rough doormat
36. 36.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
37. 37.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a box pushed on carpet (d) chalk on a gym bar
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
40. 40.🛞 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. How many newtons more were needed on sandpaper than on ice?

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