Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 304 · 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: sand on a slippery path gives more friction. (a) True (b) False
2. 2.True or false: chalk on a gym bar gives more friction. (a) False (b) True
3. 3.True or false: a smooth steel slide gives more friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a box pushed on carpet (d) a grippy rubber sole
5. 5.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
6. 6.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
7. 7.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
8. 8.True or false: a grippy rubber sole gives less friction. (a) True (b) False
9. 9.🛞 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 wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
10. 10.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) cold (d) wet
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
12. 12.True or false: a smooth steel slide gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
17. 17.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
18. 18.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) skating on ice (d) a grippy rubber sole
19. 19.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
20. 20.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
21. 21.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a wheel on ball bearings (d) skating on ice
22. 22.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
23. 23.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
25. 25.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a tyre with deep treads (d) powder on a carrom board
28. 28.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
29. 29.True or false: a tyre with deep treads gives less friction. (a) True (b) False
30. 30.True or false: chalk on a gym bar gives less friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
35. 35.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
36. 36.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
37. 37.True or false: a grippy rubber sole gives more friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.🛞 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 8 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
40. 40.True or false: sand on a slippery path gives less friction. (a) True (b) False

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