Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 756 · 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.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 11 N, ice 1 N, a glass sheet 3 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
4. 4.True or false: a box pushed on carpet gives more friction. (a) True (b) False
5. 5.True or false: skating on ice gives more friction. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) a smooth steel slide (d) oil on a squeaky hinge
7. 7.🛞 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 9 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
8. 8.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
12. 12.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
13. 13.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
14. 14.True or false: powder on a carrom board gives more friction. (a) True (b) False
15. 15.🛞 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 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
16. 16.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) a rough doormat (d) a tyre with deep treads
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
24. 24.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) chalk on a gym bar (c) powder on a carrom board (d) a smooth steel slide
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
27. 27.🛞 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 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 15 N. How many newtons more were needed on sandpaper than on ice?
30. 30.True or false: a rough doormat gives less friction. (a) False (b) True
31. 31.True or false: chalk on a gym bar gives more friction. (a) True (b) False
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.True or false: sand on a slippery path gives more friction. (a) True (b) False
34. 34.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
35. 35.True or false: skating on ice gives less friction. (a) False (b) True
36. 36.True or false: a rough doormat gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
39. 39.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a grippy rubber sole (d) sand on a slippery path
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 11 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet

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