Engineering Worksheet: Friction

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

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