Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 150 · 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.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
3. 3.🛞 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 7 N, a carpet 11 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
4. 4.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
6. 6.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) powder on a carrom board (d) skating on ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
11. 11.True or false: a tyre with deep treads gives less friction. (a) True (b) False
12. 12.🛞 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, sandpaper 7 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) a tyre with deep treads (d) a grippy rubber sole
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a grippy rubber sole (d) a tyre with deep treads
16. 16.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 11 N, sandpaper 15 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
18. 18.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
19. 19.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
20. 20.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) chalk on a gym bar (d) a box pushed on carpet
21. 21.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
22. 22.True or false: a rough doormat gives less friction. (a) False (b) True
23. 23.True or false: powder on a carrom board gives less friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) chalk on a gym bar (d) a smooth steel slide
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
26. 26.True or false: a smooth steel slide gives less friction. (a) True (b) False
27. 27.True or false: a box pushed on carpet gives less friction. (a) False (b) True
28. 28.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
29. 29.🛞 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, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
30. 30.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 6 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) oil on a squeaky hinge (d) powder on a carrom board
33. 33.True or false: a grippy rubber sole gives less friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) sand on a slippery path (d) a smooth steel slide
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, sandpaper 9 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
39. 39.True or false: a wet tiled floor gives less friction. (a) False (b) True
40. 40.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True

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