Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 982 · 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 is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a wet tiled floor (d) chalk on a gym bar
2. 2.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
3. 3.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
4. 4.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
5. 5.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) add sand (d) oil the moving parts
6. 6.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
7. 7.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a box pushed on carpet (d) a wheel on ball bearings
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
10. 10.True or false: a box pushed on carpet gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
13. 13.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
14. 14.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
15. 15.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
16. 16.True or false: a grippy rubber sole gives more friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
18. 18.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to grip the road (d) to go slower
19. 19.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
20. 20.True or false: sand on a slippery path gives less friction. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a grippy rubber sole (d) powder on a carrom board
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a rough doormat (d) oil on a squeaky hinge
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
24. 24.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
25. 25.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a box pushed on carpet
26. 26.True or false: a grippy rubber sole gives less friction. (a) False (b) True
27. 27.True or false: a tyre with deep treads gives more friction. (a) False (b) True
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 5 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
29. 29.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
30. 30.🛞 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 carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
31. 31.True or false: skating on ice gives more friction. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) a smooth steel slide
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) powder on a carrom board (d) a tyre with deep treads
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
37. 37.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
38. 38.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
39. 39.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
40. 40.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards

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