Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 137 · 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: shoe soles wearing out? (a) a problem (b) helpful
2. 2.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
4. 4.True or false: a box pushed on carpet gives less friction. (a) False (b) True
5. 5.🛞 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 5 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
6. 6.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
7. 7.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
9. 9.🛞 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 wooden plank 7 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
10. 10.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) chalk on a gym bar (d) a smooth steel slide
13. 13.True or false: a box pushed on carpet gives more friction. (a) True (b) False
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) powder on a carrom board (d) skating on ice
16. 16.🔍 Which is the odd one out? (a) powder on a carrom board (b) chalk on a gym bar (c) skating on ice (d) oil on a squeaky hinge
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
18. 18.True or false: skating on ice gives more friction. (a) False (b) True
19. 19.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
20. 20.True or false: a tyre with deep treads gives more friction. (a) False (b) True
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
22. 22.🛞 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 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
23. 23.🛞 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 9 N, a carpet 13 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: sandpaper 7 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
25. 25.True or false: a wet tiled floor gives more friction. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board
27. 27.True or false: a wet tiled floor gives less friction. (a) False (b) True
28. 28.True or false: a rough doormat gives less friction. (a) False (b) True
29. 29.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
30. 30.🛞 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 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 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 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
33. 33.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a rough doormat (d) a tyre with deep treads
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a rough doormat (d) skating on ice
36. 36.🛞 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, a carpet 5 N. How many newtons more were needed on a carpet than on ice?
37. 37.True or false: chalk on a gym bar gives less friction. (a) False (b) True
38. 38.True or false: chalk on a gym bar gives more friction. (a) True (b) False
39. 39.True or false: a rough doormat gives more friction. (a) False (b) True
40. 40.🛞 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 11 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?

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