Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 122 · 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: ice 4 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
2. 2.🛞 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 11 N, a glass sheet 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
3. 3.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
4. 4.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
5. 5.True or false: a grippy rubber sole gives more friction. (a) True (b) False
6. 6.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
7. 7.🛞 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. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 3 N, a glass sheet 6 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
12. 12.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
13. 13.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
14. 14.True or false: a tyre with deep treads gives more friction. (a) False (b) True
15. 15.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a tyre with deep treads (d) a rough doormat
17. 17.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) a grippy rubber sole
19. 19.🛞 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 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) magnetic (d) wet
21. 21.True or false: a rough doormat gives less friction. (a) True (b) False
22. 22.True or false: a wet tiled floor gives more friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) powder on a carrom board (d) chalk on a gym bar
24. 24.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
26. 26.🛞 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 7 N. How many newtons more were needed on sandpaper than on ice?
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 1 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a rough doormat (d) a wet tiled floor
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
31. 31.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a rough doormat (d) skating on ice
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a grippy rubber sole (d) a smooth steel slide
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a smooth steel slide
35. 35.🛞 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 2 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
38. 38.True or false: a tyre with deep treads gives less friction. (a) False (b) True
39. 39.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
40. 40.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) oil on a squeaky hinge (d) a box pushed on carpet

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