Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 400 · 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: gripping a cricket bat? (a) a problem (b) helpful
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
3. 3.True or false: a grippy rubber sole gives less friction. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a smooth steel slide (d) a rough doormat
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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
9. 9.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
10. 10.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
11. 11.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) skating on ice (d) a tyre with deep treads
13. 13.True or false: a tyre with deep treads gives less friction. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) powder on a carrom board (d) skating on ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
18. 18.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
19. 19.True or false: a box pushed on carpet gives more friction. (a) False (b) True
20. 20.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
21. 21.True or false: a tyre with deep treads gives more friction. (a) False (b) True
22. 22.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
23. 23.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a wet tiled floor (d) a smooth steel slide
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
30. 30.🛞 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 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
32. 32.True or false: chalk on a gym bar gives more friction. (a) True (b) False
33. 33.True or false: powder on a carrom board gives more friction. (a) False (b) True
34. 34.True or false: a box pushed on carpet gives less friction. (a) False (b) True
35. 35.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
36. 36.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
37. 37.🛞 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 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful

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