Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 828 · 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: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
3. 3.True or false: a grippy rubber sole gives less friction. (a) True (b) False
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
5. 5.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a wet tiled floor (d) oil on a squeaky hinge
7. 7.🛞 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 12 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
9. 9.True or false: chalk on a gym bar gives more friction. (a) False (b) True
10. 10.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
11. 11.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a box pushed on carpet (d) a smooth steel slide
12. 12.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
13. 13.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
14. 14.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
15. 15.True or false: a wet tiled floor gives more friction. (a) False (b) True
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a rough doormat (d) a wet tiled floor
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
20. 20.🛞 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 8 N, sandpaper 12 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a tyre with deep treads (d) powder on a carrom board
24. 24.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
25. 25.🛞 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?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
27. 27.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a tyre with deep treads (d) a rough doormat
28. 28.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) chalk on a gym bar (d) oil on a squeaky hinge
31. 31.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
33. 33.🛞 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, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) ice
34. 34.True or false: sand on a slippery path gives more friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
36. 36.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) cold (d) magnetic
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
39. 39.True or false: a box pushed on carpet gives more friction. (a) True (b) False
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem

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