Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 547 · 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: sand on a slippery path gives less friction. (a) False (b) True
2. 2.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
3. 3.True or false: chalk on a gym bar gives less friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) a box pushed on carpet (d) oil on a squeaky hinge
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 7 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
6. 6.True or false: skating on ice gives more friction. (a) True (b) False
7. 7.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
9. 9.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
10. 10.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
11. 11.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.True or false: powder on a carrom board gives more friction. (a) False (b) True
14. 14.🛞 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, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
16. 16.True or false: a smooth steel slide gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a box pushed on carpet (d) a grippy rubber sole
18. 18.🔍 Which is the odd one out? (a) a rough doormat (b) skating on ice (c) a smooth steel slide (d) powder on a carrom board
19. 19.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
20. 20.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
21. 21.True or false: a rough doormat gives more friction. (a) True (b) False
22. 22.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) sand on a slippery path (d) a tyre with deep treads
25. 25.True or false: a box pushed on carpet gives less friction. (a) True (b) False
26. 26.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a wheel on ball bearings
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 9 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
31. 31.True or false: a wet tiled floor gives less friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a tyre with deep treads (d) chalk on a gym bar
33. 33.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
34. 34.🛞 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 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
35. 35.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a grippy rubber sole (d) a wheel on ball bearings
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
37. 37.🛞 More or less friction: a grippy rubber sole? (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 carpet 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on a carpet than on ice?
39. 39.True or false: a tyre with deep treads gives less friction. (a) True (b) False
40. 40.True or false: a wet tiled floor gives more friction. (a) True (b) False

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