Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 249 · 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: a box pushed on carpet gives more friction. (a) True (b) False
2. 2.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
5. 5.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) sand on a slippery path (d) a wheel on ball bearings
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
8. 8.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
9. 9.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a wheel on ball bearings (d) a smooth steel slide
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
15. 15.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
16. 16.🛞 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 carpet 5 N, sandpaper 8 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
17. 17.🔍 Which is the odd one out? (a) powder on a carrom board (b) skating on ice (c) chalk on a gym bar (d) a wet tiled floor
18. 18.True or false: a grippy rubber sole gives more friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
20. 20.True or false: powder on a carrom board gives more friction. (a) False (b) True
21. 21.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
22. 22.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
23. 23.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) a wet tiled floor (d) a box pushed on carpet
24. 24.True or false: chalk on a gym bar gives more friction. (a) True (b) False
25. 25.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
26. 26.True or false: a wet tiled floor gives more friction. (a) False (b) True
27. 27.True or false: a rough doormat 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 wooden plank 8 N, a carpet 12 N, sandpaper 15 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 13 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
32. 32.🛞 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. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
33. 33.🔍 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
34. 34.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
35. 35.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a rough doormat (d) a wheel on ball bearings
36. 36.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
37. 37.🛞 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 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet

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