Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 548 · 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: sand on a slippery path gives less friction. (a) True (b) False
2. 2.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber
3. 3.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
5. 5.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) oil on a squeaky hinge
6. 6.🛞 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 wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
7. 7.True or false: a wet tiled floor gives more friction. (a) False (b) True
8. 8.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
9. 9.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
11. 11.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, sandpaper 6 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 11 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) sand on a slippery path (d) a wheel on ball bearings
19. 19.True or false: skating on ice gives more friction. (a) False (b) True
20. 20.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) skating on ice (d) sand on a slippery path
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 6 N, a wooden plank 8 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
25. 25.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
26. 26.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wheel on ball bearings (d) a smooth steel slide
27. 27.🛞 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 wooden plank 4 N, a carpet 5 N. How many newtons more were needed on a carpet than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 7 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.🛞 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 2 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
32. 32.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
33. 33.🛞 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 5 N, sandpaper 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
34. 34.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a smooth steel slide (d) a wheel on ball bearings
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) a smooth steel slide (d) a box pushed on carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 15 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) powder on a carrom board (d) a rough doormat

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