Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 296 · 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: skating on ice? (a) more friction (b) less friction
2. 2.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
6. 6.True or false: skating on ice gives more friction. (a) False (b) True
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.True or false: a grippy rubber sole gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
10. 10.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) powder on a carrom board (d) oil on a squeaky hinge
12. 12.🛞 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 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 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 2 N. How many newtons more were needed on sandpaper than on ice?
14. 14.True or false: a rough doormat gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) sand on a slippery path
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
20. 20.True or false: a tyre with deep treads gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a box pushed on carpet (d) skating on ice
22. 22.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
23. 23.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
24. 24.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
25. 25.True or false: oil on a squeaky hinge 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: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
27. 27.True or false: a box pushed on carpet gives more friction. (a) False (b) True
28. 28.True or false: a grippy rubber sole gives less friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
36. 36.True or false: a smooth steel slide gives more friction. (a) False (b) True
37. 37.🛞 More or less friction: a tyre with deep treads? (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 glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (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 4 N, a carpet 7 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem

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