Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 577 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) powder on a carrom board (d) a wet tiled floor
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
5. 5.🛞 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 wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
6. 6.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a smooth steel slide (d) skating on ice
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
9. 9.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
10. 10.True or false: sand on a slippery path gives less friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) oil on a squeaky hinge (d) a tyre with deep treads
13. 13.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
14. 14.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
15. 15.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
16. 16.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
17. 17.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
18. 18.True or false: a box pushed on carpet gives less friction. (a) True (b) False
19. 19.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
20. 20.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
21. 21.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
25. 25.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
26. 26.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a grippy rubber sole (d) skating on ice
28. 28.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) a wooden plank
30. 30.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
32. 32.🛞 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 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) skating on ice (d) a box pushed on carpet
37. 37.True or false: sand on a slippery path gives more friction. (a) True (b) False
38. 38.True or false: a wet tiled floor gives more friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
40. 40.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a wheel on ball bearings (d) a wet tiled floor

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