Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 506 · 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) magnetic (c) warm (d) wet
2. 2.🛞 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, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🔍 Which is the odd one out? (a) skating on ice (b) a tyre with deep treads (c) chalk on a gym bar (d) a grippy rubber sole
4. 4.🛞 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 9 N, sandpaper 13 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
5. 5.True or false: a grippy rubber sole gives more friction. (a) False (b) True
6. 6.True or false: a rough doormat gives more friction. (a) True (b) False
7. 7.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) sand on a slippery path (d) a rough doormat
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: a wooden plank 9 N, sandpaper 12 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a grippy rubber sole (d) a box pushed on carpet
11. 11.True or false: sand on a slippery path gives less friction. (a) True (b) False
12. 12.True or false: a box pushed on carpet gives less friction. (a) False (b) True
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, a carpet 12 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
16. 16.True or false: a grippy rubber sole gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
18. 18.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 6 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
22. 22.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) chalk on a gym bar
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a grippy rubber sole (d) a smooth steel slide
26. 26.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
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: a wooden plank 2 N, a carpet 3 N, sandpaper 5 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
31. 31.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
33. 33.🛞 Friction acts … (a) only upwards (b) with the motion (c) only on ice (d) against the motion
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
36. 36.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) oil on a squeaky hinge (d) a box pushed on carpet
37. 37.🛞 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 wooden plank 9 N, sandpaper 11 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
38. 38.True or false: skating on ice gives less friction. (a) False (b) True
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet

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