Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 911 · 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: a grippy rubber sole gives more friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 3 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
4. 4.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a wheel on ball bearings (d) skating on ice
6. 6.True or false: a box pushed on carpet gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) powder on a carrom board (d) a tyre with deep treads
9. 9.🛞 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 9 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
10. 10.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
11. 11.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
13. 13.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) chalk on a gym bar (d) a tyre with deep treads
15. 15.🛞 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 most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
20. 20.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a grippy rubber sole
21. 21.True or false: a tyre with deep treads gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
23. 23.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
24. 24.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
28. 28.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
29. 29.True or false: a rough doormat gives more friction. (a) False (b) True
30. 30.🛞 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 6 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
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 glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
33. 33.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: skating on ice gives less friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards

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