Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 474 · 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: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
2. 2.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
3. 3.🛞 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, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
4. 4.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
6. 6.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a rough doormat (d) a grippy rubber sole
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
9. 9.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) magnetic (d) cold
10. 10.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
17. 17.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a box pushed on carpet (d) a smooth steel slide
18. 18.True or false: skating on ice gives less friction. (a) True (b) False
19. 19.🛞 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 wooden plank 10 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
20. 20.True or false: chalk on a gym bar gives less friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
22. 22.🛞 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, sandpaper 13 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
23. 23.🛞 Friction acts … (a) only upwards (b) with the motion (c) against the motion (d) only on ice
24. 24.True or false: a smooth steel slide gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 11 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
27. 27.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
29. 29.True or false: chalk on a gym bar gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
33. 33.🛞 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 carpet 8 N, sandpaper 11 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
34. 34.True or false: sand on a slippery path gives less friction. (a) False (b) True
35. 35.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
36. 36.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) sand on a slippery path (d) a grippy rubber sole
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
39. 39.🛞 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 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?

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