Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 602 · 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.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a wheel on ball bearings (d) a rough doormat
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
4. 4.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
5. 5.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 6 N, a carpet 8 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: ice 4 N, a wooden plank 8 N, a carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
8. 8.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
9. 9.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
12. 12.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) oil on a squeaky hinge (d) powder on a carrom board
13. 13.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
14. 14.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
15. 15.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
16. 16.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a smooth steel slide (d) a tyre with deep treads
17. 17.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
20. 20.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wet tiled floor
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
23. 23.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
24. 24.True or false: a grippy rubber sole gives more friction. (a) True (b) False
25. 25.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
26. 26.🛞 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 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
28. 28.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
29. 29.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) a tyre with deep treads (d) powder on a carrom board
31. 31.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
32. 32.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
35. 35.True or false: a rough doormat 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 carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
37. 37.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a grippy rubber sole (c) sand on a slippery path (d) chalk on a gym bar
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a grippy rubber sole
39. 39.True or false: powder on a carrom board gives less friction. (a) True (b) False
40. 40.True or false: a grippy rubber sole gives less friction. (a) True (b) False

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