Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 971 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
4. 4.🛞 More or less friction: sand on a slippery path? (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 8 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
6. 6.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a tyre with deep treads (d) powder on a carrom board
8. 8.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
12. 12.True or false: a grippy rubber sole gives less friction. (a) False (b) True
13. 13.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
14. 14.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
15. 15.True or false: chalk on a gym bar gives more friction. (a) True (b) False
16. 16.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
17. 17.🛞 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 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
18. 18.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
19. 19.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
20. 20.True or false: a grippy rubber sole gives more friction. (a) True (b) False
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
22. 22.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
23. 23.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
24. 24.True or false: a rough doormat gives less friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
27. 27.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) a wheel on ball bearings
28. 28.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
29. 29.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
30. 30.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
32. 32.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) a rough doormat (d) sand on a slippery path
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a grippy rubber sole (d) a box pushed on carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
36. 36.True or false: powder on a carrom board gives less friction. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a rough doormat (d) skating on ice
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
39. 39.True or false: skating on ice gives less friction. (a) False (b) True
40. 40.True or false: chalk on a gym bar gives less friction. (a) False (b) True

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