Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 197 · 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: a box pushed on carpet? (a) less friction (b) more friction
2. 2.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
4. 4.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
6. 6.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
7. 7.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wheel on ball bearings (c) chalk on a gym bar (d) a rough doormat
8. 8.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) oil on a squeaky hinge (d) sand on a slippery path
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 3 N, a carpet 4 N, sandpaper 6 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
10. 10.True or false: a smooth steel slide gives more friction. (a) False (b) True
11. 11.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
12. 12.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a grippy rubber sole (d) chalk on a gym bar
15. 15.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
17. 17.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) a rough doormat (d) a wet tiled floor
18. 18.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a grippy rubber sole
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) a grippy rubber sole (d) sand on a slippery path
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
22. 22.🛞 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. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
24. 24.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) chalk on a gym bar (d) a box pushed on carpet
26. 26.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
27. 27.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
29. 29.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
30. 30.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
31. 31.True or false: powder on a carrom board gives less friction. (a) True (b) False
32. 32.True or false: a tyre with deep treads gives less friction. (a) True (b) False
33. 33.True or false: skating on ice gives less friction. (a) True (b) False
34. 34.🛞 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 9 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
36. 36.True or false: a box pushed on carpet gives more friction. (a) False (b) True
37. 37.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
38. 38.🛞 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 8 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
40. 40.True or false: a rough doormat gives more friction. (a) True (b) False

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