Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 537 · 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.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
3. 3.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
4. 4.🛞 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 1 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
5. 5.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
6. 6.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
7. 7.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
10. 10.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
11. 11.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, ice 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
14. 14.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a rough doormat (d) sand on a slippery path
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 5 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) oil on a squeaky hinge (d) sand on a slippery path
17. 17.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
19. 19.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 6 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a tyre with deep treads (d) a wheel on ball bearings
24. 24.True or false: a rough doormat gives more friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) powder on a carrom board (d) chalk on a gym bar
26. 26.True or false: a wet tiled floor gives less friction. (a) False (b) True
27. 27.🛞 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 10 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
28. 28.🛞 More or less friction: a smooth steel slide? (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 carpet 7 N, sandpaper 11 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
30. 30.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
33. 33.True or false: a box pushed on carpet gives more friction. (a) True (b) False
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 5 N, ice 2 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
35. 35.True or false: a grippy rubber sole gives more friction. (a) False (b) True
36. 36.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
37. 37.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
38. 38.True or false: a tyre with deep treads gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem

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