Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 119 · 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: sandpaper 12 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?
2. 2.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
4. 4.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 7 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
6. 6.🛞 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 carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a grippy rubber sole (d) a rough doormat
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
11. 11.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
12. 12.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
13. 13.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🛞 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 8 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
21. 21.True or false: a box pushed on carpet gives more friction. (a) True (b) False
22. 22.True or false: sand on a slippery path gives less friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a wheel on ball bearings (d) a smooth steel slide
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
26. 26.True or false: a tyre with deep treads gives less friction. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) skating on ice (d) a smooth steel slide
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 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 carpet 7 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
31. 31.True or false: skating on ice gives less friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) chalk on a gym bar (d) a tyre with deep treads
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
36. 36.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
37. 37.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
38. 38.True or false: a rough doormat gives more friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) powder on a carrom board (d) a wet tiled floor
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful

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