Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 201 · 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: oil on a squeaky hinge? (a) more friction (b) less friction
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
4. 4.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) a rough doormat (d) a grippy rubber sole
5. 5.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 10 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
9. 9.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
12. 12.True or false: a tyre with deep treads gives more friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
15. 15.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
17. 17.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
20. 20.True or false: a wet tiled floor 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: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
24. 24.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) sand on a slippery path (d) chalk on a gym bar
25. 25.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
26. 26.True or false: a smooth steel slide gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
28. 28.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
29. 29.True or false: a grippy rubber sole gives less friction. (a) False (b) True
30. 30.🛞 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 carpet 8 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a tyre with deep treads (d) skating on ice
33. 33.🛞 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 wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
34. 34.True or false: chalk on a gym bar gives less friction. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a tyre with deep treads (d) oil on a squeaky hinge
36. 36.🛞 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 7 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
37. 37.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 11 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 7 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank

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