Engineering Worksheet: Friction

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

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