Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 51 · 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 rough doormat gives less friction. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
6. 6.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
7. 7.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
8. 8.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
9. 9.🔍 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 tyre with deep treads
10. 10.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) sandpaper
13. 13.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
14. 14.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
16. 16.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 8 N, ice 3 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: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 9 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
19. 19.True or false: a smooth steel slide gives more friction. (a) True (b) False
20. 20.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
22. 22.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 10 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
24. 24.True or false: a tyre with deep treads gives more friction. (a) False (b) True
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
26. 26.True or false: a grippy rubber sole gives more friction. (a) True (b) False
27. 27.🛞 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 4 N. How many newtons more were needed on sandpaper than on ice?
28. 28.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to grip the road (d) to save rubber
31. 31.True or false: skating on ice gives more friction. (a) True (b) False
32. 32.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 3 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) powder on a carrom board (d) sand on a slippery path
36. 36.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a rough doormat (d) a wet tiled floor
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.True or false: a tyre with deep treads gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem

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