Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 372 · 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 rough doormat gives less friction. (a) True (b) False
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) glass (d) polished marble
3. 3.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
4. 4.True or false: a tyre with deep treads gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
7. 7.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
8. 8.🛞 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 6 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 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, sandpaper 5 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
11. 11.🛞 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 5 N, a carpet 7 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
12. 12.True or false: skating on ice gives more friction. (a) True (b) False
13. 13.True or false: sand on a slippery path gives more friction. (a) False (b) True
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
20. 20.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
22. 22.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a rough doormat (d) a tyre with deep treads
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a tyre with deep treads (d) a grippy rubber sole
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 4 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
26. 26.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
27. 27.🛞 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 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
28. 28.🛞 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, ice 1 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.True or false: chalk on a gym bar gives less friction. (a) True (b) False
31. 31.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 5 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.True or false: a box pushed on carpet gives more friction. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) skating on ice (b) a smooth steel slide (c) a rough doormat (d) a wet tiled floor
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) powder on a carrom board (d) a tyre with deep treads
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem

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