Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 846 · 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 surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
4. 4.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 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?
6. 6.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to look nice (d) to grip the road
7. 7.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
8. 8.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a rough doormat (d) skating on ice
10. 10.True or false: a smooth steel slide gives more friction. (a) False (b) True
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
13. 13.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
15. 15.True or false: powder on a carrom board gives less friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
17. 17.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
19. 19.True or false: a wet tiled floor gives less friction. (a) True (b) False
20. 20.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
21. 21.True or false: a tyre with deep treads gives less friction. (a) True (b) False
22. 22.True or false: a wet tiled floor gives more friction. (a) False (b) True
23. 23.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
26. 26.🛞 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 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) chalk on a gym bar (d) a wet tiled floor
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
30. 30.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
31. 31.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a box pushed on carpet (d) powder on a carrom board
32. 32.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
33. 33.True or false: chalk on a gym bar gives more friction. (a) False (b) True
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
35. 35.🛞 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 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a tyre with deep treads (d) chalk on a gym bar
37. 37.True or false: a grippy rubber sole gives more friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a box pushed on carpet (d) sand on a slippery path
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 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 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on a glass sheet?

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