Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 287 · 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.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
2. 2.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
3. 3.True or false: a tyre with deep treads gives less friction. (a) True (b) False
4. 4.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 14 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
6. 6.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) a grippy rubber sole (d) chalk on a gym bar
7. 7.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
8. 8.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
9. 9.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
10. 10.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
11. 11.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
12. 12.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
16. 16.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) sand on a slippery path (d) oil on a squeaky hinge
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
18. 18.True or false: a wet tiled floor gives more friction. (a) False (b) True
19. 19.True or false: a smooth steel slide gives more friction. (a) False (b) True
20. 20.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
21. 21.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a wheel on ball bearings (d) a smooth steel slide
22. 22.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) skating on ice (d) oil on a squeaky hinge
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
24. 24.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
26. 26.True or false: a grippy rubber sole gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 7 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
28. 28.True or false: skating on ice gives less friction. (a) True (b) False
29. 29.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a rough doormat (d) chalk on a gym bar
30. 30.True or false: a grippy rubber sole gives less friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
33. 33.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 4 N, a glass sheet 8 N. How many newtons more were needed on sandpaper than on ice?
35. 35.True or false: chalk on a gym bar gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 4 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
39. 39.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a rough doormat (d) a smooth steel slide

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