Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 841 · 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 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.🔍 Which is the odd one out? (a) skating on ice (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
5. 5.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 14 N, ice 4 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
7. 7.True or false: a rough doormat gives less friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
9. 9.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) chalk on a gym bar (d) a tyre with deep treads
11. 11.True or false: a grippy rubber sole gives more friction. (a) False (b) True
12. 12.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 8 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
15. 15.True or false: a box pushed on carpet gives less friction. (a) True (b) False
16. 16.🛞 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 wooden plank 6 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a wet tiled floor (d) powder on a carrom board
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
19. 19.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
20. 20.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 4 N, a wooden plank 8 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) ice
23. 23.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
24. 24.🛞 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 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, ice 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
26. 26.True or false: chalk on a gym bar gives less friction. (a) False (b) True
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
29. 29.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) a wheel on ball bearings (d) powder on a carrom board
30. 30.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
31. 31.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
32. 32.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
34. 34.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) press parts harder (d) make parts rough
35. 35.True or false: a box pushed on carpet gives more friction. (a) False (b) True
36. 36.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
37. 37.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
38. 38.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
39. 39.True or false: sand on a slippery path gives more friction. (a) True (b) False
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice

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