Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 660 · 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.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
2. 2.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 12 N, ice 4 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
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
6. 6.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
7. 7.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
8. 8.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.True or false: a smooth steel slide gives less friction. (a) True (b) False
11. 11.True or false: sand on a slippery path gives less friction. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a tyre with deep treads (d) a grippy rubber sole
13. 13.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
14. 14.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
16. 16.True or false: skating on ice gives less friction. (a) True (b) False
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 7 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
22. 22.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
23. 23.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) skating on ice (d) a wet tiled floor
24. 24.True or false: sand on a slippery path gives more friction. (a) False (b) True
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
26. 26.True or false: powder on a carrom board gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 12 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
31. 31.True or false: a grippy rubber sole gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a tyre with deep treads (d) a rough doormat
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
37. 37.True or false: a rough doormat gives more friction. (a) False (b) True
38. 38.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
39. 39.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) a smooth steel slide (d) a tyre with deep treads
40. 40.True or false: a box pushed on carpet gives more friction. (a) False (b) True

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