Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 216 · 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.🛞 Friction acts … (a) only on ice (b) with the motion (c) against the motion (d) only upwards
2. 2.True or false: a smooth steel slide gives more friction. (a) True (b) False
3. 3.True or false: a rough doormat gives less friction. (a) True (b) False
4. 4.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
9. 9.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wet tiled floor (d) a tyre with deep treads
11. 11.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 3 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
13. 13.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) skating on ice (d) a smooth steel slide
14. 14.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
16. 16.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 13 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
18. 18.True or false: a tyre with deep treads gives less friction. (a) True (b) False
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
20. 20.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
21. 21.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
22. 22.True or false: a tyre with deep treads gives more friction. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a grippy rubber sole (d) chalk on a gym bar
24. 24.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
25. 25.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
26. 26.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
28. 28.🛞 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, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) skating on ice (d) a grippy rubber sole
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a wheel on ball bearings (d) sand on a slippery path
32. 32.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) powder on a carrom board (d) a grippy rubber sole
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, ice 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 11 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
36. 36.True or false: sand on a slippery path gives less friction. (a) True (b) False
37. 37.🛞 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 carpet 5 N, sandpaper 6 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
39. 39.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem

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