Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 46 · 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: chalk on a gym bar? (a) more friction (b) less friction
2. 2.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
3. 3.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a smooth steel slide (d) skating on ice
4. 4.🛞 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 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a glass sheet 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a box pushed on carpet
8. 8.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a smooth steel slide (d) a wet tiled floor
9. 9.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
10. 10.True or false: powder on a carrom board gives more friction. (a) True (b) False
11. 11.🛞 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 most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
12. 12.True or false: sand on a slippery path gives less friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
15. 15.True or false: sand on a slippery path gives more friction. (a) False (b) True
16. 16.True or false: chalk on a gym bar 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: sandpaper 9 N, ice 2 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 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 8 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
19. 19.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a rough doormat (d) a grippy rubber sole
23. 23.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
24. 24.True or false: skating on ice gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a smooth steel slide (d) a box pushed on carpet
27. 27.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
29. 29.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a wet tiled floor (d) skating on ice
30. 30.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 11 N, sandpaper 12 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 10 N, sandpaper 13 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
35. 35.True or false: a wet tiled floor gives less friction. (a) True (b) False
36. 36.🛞 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 6 N, a carpet 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
39. 39.🛞 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 11 N, sandpaper 13 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 3 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice

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