Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 79 · 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 upwards (b) with the motion (c) only on ice (d) against the motion
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a rough doormat (d) a smooth steel slide
4. 4.🛞 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 3 N, a carpet 6 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 10 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
6. 6.True or false: a grippy rubber sole gives more friction. (a) False (b) True
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a glass sheet
8. 8.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
9. 9.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
10. 10.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
11. 11.🛞 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 3 N, a carpet 4 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
12. 12.True or false: a grippy rubber sole gives less friction. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) chalk on a gym bar (d) a rough doormat
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
15. 15.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
16. 16.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to save rubber (d) to look nice
20. 20.True or false: sand on a slippery path gives more friction. (a) False (b) True
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
23. 23.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a grippy rubber sole (d) powder on a carrom board
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 12 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
27. 27.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) a rough doormat (d) a smooth steel slide
28. 28.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 4 N, a carpet 5 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
30. 30.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a box pushed on carpet
31. 31.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
32. 32.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
33. 33.True or false: powder on a carrom board gives more friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a rough doormat (d) chalk on a gym bar
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 9 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
36. 36.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
37. 37.True or false: chalk on a gym bar gives less friction. (a) True (b) False
38. 38.🛞 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 6 N, a carpet 7 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
39. 39.True or false: skating on ice gives less friction. (a) False (b) True
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem

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