Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 480 · 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.🛞 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 carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
3. 3.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 11 N, ice 3 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
7. 7.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
8. 8.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
9. 9.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a wet tiled floor (d) a grippy rubber sole
10. 10.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a tyre with deep treads (c) a smooth steel slide (d) oil on a squeaky hinge
11. 11.True or false: skating on ice gives more friction. (a) True (b) False
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a grippy rubber sole (c) a wheel on ball bearings (d) chalk on a gym bar
14. 14.True or false: skating on ice gives less friction. (a) False (b) True
15. 15.True or false: a wet tiled floor gives more friction. (a) True (b) False
16. 16.🛞 More or less friction: a wheel on ball bearings? (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 glass sheet 6 N, a wooden plank 9 N, a carpet 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
18. 18.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
19. 19.🛞 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, ice 1 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 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 8 N, a wooden plank 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
22. 22.True or false: a box pushed on carpet gives less friction. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a box pushed on carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a rough doormat (d) powder on a carrom board
26. 26.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
27. 27.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
28. 28.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 5 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) a smooth steel slide (d) sand on a slippery path
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
37. 37.🛞 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 glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: powder on a carrom board gives more friction. (a) False (b) True
39. 39.🛞 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 7 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem

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