Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 671 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) ice (d) glass
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
4. 4.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
6. 6.True or false: a box pushed on carpet gives more friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a rough doormat (d) a grippy rubber sole
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 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) a wooden plank (d) sandpaper
11. 11.🛞 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 5 N, a carpet 9 N. How many newtons more were needed on a carpet than on ice?
12. 12.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
13. 13.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
16. 16.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
19. 19.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
21. 21.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 3 N, a glass sheet 7 N, a wooden plank 9 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) sand on a slippery path (d) chalk on a gym bar
25. 25.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
26. 26.True or false: a rough doormat gives less friction. (a) True (b) False
27. 27.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
28. 28.True or false: powder on a carrom board 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 glass sheet 3 N, a carpet 6 N, sandpaper 10 N, ice 2 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
30. 30.🔍 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
31. 31.🛞 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 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a tyre with deep treads (d) a wheel on ball bearings
35. 35.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
37. 37.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) a grippy rubber sole (d) a wet tiled floor
38. 38.True or false: a wet tiled floor gives more friction. (a) True (b) False
39. 39.True or false: a wet tiled floor gives less friction. (a) True (b) False
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm

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