Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 208 · 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: oil on a squeaky hinge? (a) less friction (b) more friction
2. 2.True or false: a smooth steel slide gives more friction. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) skating on ice
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
7. 7.True or false: a box pushed on carpet gives less friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a wheel on ball bearings (d) a grippy rubber sole
11. 11.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a tyre with deep treads (d) a box pushed on carpet
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 2 N, a glass sheet 6 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) powder on a carrom board
15. 15.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
17. 17.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
18. 18.🛞 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 5 N, a glass sheet 1 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
23. 23.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
25. 25.True or false: chalk on a gym bar gives less friction. (a) False (b) True
26. 26.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
27. 27.🛞 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, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.True or false: a tyre with deep treads gives more friction. (a) False (b) True
29. 29.True or false: sand on a slippery path gives less friction. (a) True (b) False
30. 30.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
33. 33.True or false: a box pushed on carpet gives more friction. (a) True (b) False
34. 34.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
35. 35.True or false: sand on a slippery path gives more friction. (a) False (b) True
36. 36.🛞 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 7 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
37. 37.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 2 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
39. 39.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
40. 40.🛞 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 most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice

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