Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 966 · 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: chalk on a gym bar gives less friction. (a) True (b) False
2. 2.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
3. 3.🛞 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 9 N, ice 1 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
4. 4.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
5. 5.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
6. 6.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
9. 9.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
10. 10.True or false: chalk on a gym bar gives more friction. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) skating on ice
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a box pushed on carpet (d) a tyre with deep treads
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
14. 14.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
15. 15.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
16. 16.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
18. 18.🛞 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 wooden plank 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
19. 19.True or false: a tyre with deep treads gives more friction. (a) True (b) False
20. 20.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
21. 21.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
25. 25.True or false: a wet tiled floor gives more friction. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a rough doormat (d) a wheel on ball bearings
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 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) a rough doormat (c) powder on a carrom board (d) a box pushed on carpet
29. 29.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
30. 30.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a rough doormat (d) a wheel on ball bearings
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
34. 34.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
36. 36.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a grippy rubber sole (d) sand on a slippery path
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 16 N, ice 4 N, a wooden plank 8 N, a carpet 12 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
39. 39.🛞 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 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
40. 40.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a grippy rubber sole (d) skating on ice

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