Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 229 · 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: a glass sheet 6 N, a carpet 9 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
3. 3.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a wheel on ball bearings (d) a tyre with deep treads
4. 4.True or false: a tyre with deep treads gives less friction. (a) False (b) True
5. 5.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
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 4 N, a carpet 5 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) powder on a carrom board (d) a box pushed on carpet
8. 8.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
9. 9.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
12. 12.True or false: a rough doormat gives less friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) a box pushed on carpet (d) sand on a slippery path
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
15. 15.True or false: a smooth steel slide gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) sand on a slippery path (d) a wet tiled floor
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
25. 25.🛞 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 wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.True or false: sand on a slippery path gives more friction. (a) False (b) True
27. 27.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
29. 29.True or false: sand on a slippery path gives less friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
35. 35.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) oil on a squeaky hinge (d) skating on ice
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 12 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful

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