Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 58 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
2. 2.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a tyre with deep treads (d) a wheel on ball bearings
3. 3.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
4. 4.True or false: a wet tiled floor gives less friction. (a) False (b) True
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
7. 7.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
10. 10.True or false: chalk on a gym bar gives less friction. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a tyre with deep treads (d) powder on a carrom board
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
13. 13.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) skating on ice (d) a smooth steel slide
15. 15.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
18. 18.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 6 N, sandpaper 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
20. 20.True or false: sand on a slippery path gives more friction. (a) False (b) True
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
23. 23.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
24. 24.True or false: sand on a slippery path gives less friction. (a) True (b) False
25. 25.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
26. 26.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) a rough doormat
27. 27.True or false: powder on a carrom board gives less friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
30. 30.True or false: skating on ice gives more friction. (a) False (b) True
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 6 N, a glass sheet 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
32. 32.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
33. 33.True or false: skating on ice gives less friction. (a) True (b) False
34. 34.True or false: a grippy rubber sole gives less friction. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a smooth steel slide (d) a box pushed on carpet
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
38. 38.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
39. 39.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
40. 40.🛞 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 9 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper

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