Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 153 · 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.True or false: skating on ice gives less friction. (a) False (b) True
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a grippy rubber sole (d) sand on a slippery path
5. 5.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
6. 6.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wet tiled floor (d) a grippy rubber sole
11. 11.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wheel on ball bearings (d) sand on a slippery path
12. 12.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
16. 16.True or false: sand on a slippery path gives less friction. (a) True (b) False
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
18. 18.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
20. 20.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
21. 21.True or false: a tyre with deep treads gives less friction. (a) True (b) False
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a rough doormat (d) a grippy rubber sole
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
26. 26.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a grippy rubber sole (d) a wet tiled floor
29. 29.True or false: a grippy rubber sole gives more friction. (a) True (b) False
30. 30.🛞 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 carpet 3 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: chalk on a gym bar gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
36. 36.🛞 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 wooden plank 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
37. 37.True or false: chalk on a gym bar gives more friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 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 wheel on ball bearings (c) a box pushed on carpet (d) chalk on a gym bar
40. 40.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False

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