Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 92 · 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 less friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a grippy rubber sole (d) powder on a carrom board
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
4. 4.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
5. 5.True or false: a smooth steel slide gives more friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 8 N, sandpaper 11 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
7. 7.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
9. 9.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
14. 14.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a rough doormat (d) oil on a squeaky hinge
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) sand on a slippery path (d) a rough doormat
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 12 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a smooth steel slide (d) powder on a carrom board
19. 19.🛞 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 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
22. 22.🛞 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 2 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.🛞 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 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
26. 26.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
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 8 N, a carpet 11 N, sandpaper 14 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
29. 29.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
32. 32.True or false: sand on a slippery path gives less friction. (a) False (b) True
33. 33.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
34. 34.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
35. 35.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) chalk on a gym bar (d) a tyre with deep treads
36. 36.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
37. 37.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a smooth steel slide
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
39. 39.True or false: chalk on a gym bar gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet

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