Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 357 · 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) warm (c) magnetic (d) wet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
3. 3.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
5. 5.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) chalk on a gym bar (d) oil on a squeaky hinge
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
9. 9.🛞 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 4 N, a glass sheet 7 N. How many newtons more were needed on a carpet than on ice?
10. 10.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a smooth steel slide (d) a box pushed on carpet
11. 11.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.True or false: a grippy rubber sole gives more friction. (a) True (b) False
16. 16.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
17. 17.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
18. 18.🛞 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 carpet 3 N, sandpaper 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
19. 19.True or false: sand on a slippery path gives more friction. (a) True (b) False
20. 20.True or false: powder on a carrom board gives less friction. (a) False (b) True
21. 21.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
22. 22.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
23. 23.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
24. 24.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
26. 26.True or false: skating on ice gives more friction. (a) True (b) False
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
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 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a carpet (d) a wooden plank
30. 30.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a glass sheet
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
34. 34.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 12 N, sandpaper 13 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
36. 36.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) sand on a slippery path (d) a box pushed on carpet
37. 37.True or false: skating on ice gives less friction. (a) False (b) True
38. 38.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
39. 39.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?

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