Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 408 · 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.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) oil on a squeaky hinge (d) sand on a slippery path
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.True or false: a grippy rubber sole gives less friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
8. 8.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
9. 9.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
10. 10.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a wooden plank 12 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a wheel on ball bearings (d) a wet tiled floor
14. 14.True or false: a rough doormat gives less friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 4 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
19. 19.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a tyre with deep treads (d) a grippy rubber sole
20. 20.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) powder on a carrom board (d) a grippy rubber sole
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
24. 24.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
25. 25.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
26. 26.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
29. 29.🛞 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 carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
35. 35.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wet tiled floor (d) a rough doormat
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
37. 37.True or false: skating on ice 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: a wooden plank 9 N, sandpaper 11 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) oil on a squeaky hinge (d) sand on a slippery path
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?

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