Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 325 · 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: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) skating on ice (d) powder on a carrom board
5. 5.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a grippy rubber sole (d) oil on a squeaky hinge
6. 6.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
8. 8.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
9. 9.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) a rough doormat (d) a wheel on ball bearings
10. 10.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
12. 12.True or false: chalk on a gym bar gives less friction. (a) True (b) False
13. 13.True or false: sand on a slippery path gives more friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a grippy rubber sole (d) sand on a slippery path
15. 15.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
16. 16.🛞 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 most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
19. 19.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
20. 20.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
22. 22.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a grippy rubber sole (d) a wet tiled floor
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. How many newtons more were needed on a carpet than on ice?
25. 25.True or false: a smooth steel slide gives more friction. (a) True (b) False
26. 26.🛞 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 10 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
27. 27.True or false: a grippy rubber sole gives less friction. (a) True (b) False
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
29. 29.True or false: a rough doormat gives less friction. (a) False (b) True
30. 30.True or false: sand on a slippery path gives less friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
32. 32.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
33. 33.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 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 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
38. 38.True or false: a wet tiled floor gives less friction. (a) False (b) True
39. 39.True or false: a rough doormat gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 11 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?

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