Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 962 · 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: sandpaper 9 N, ice 3 N, a glass sheet 6 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
2. 2.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
3. 3.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a box pushed on carpet (d) a tyre with deep treads
5. 5.🛞 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 2 N, a carpet 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
6. 6.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
9. 9.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a box pushed on carpet (d) sand on a slippery path
10. 10.True or false: chalk on a gym bar gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on a carpet than on ice?
13. 13.True or false: a rough doormat gives more friction. (a) False (b) True
14. 14.True or false: a wet tiled floor gives more friction. (a) True (b) False
15. 15.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
16. 16.True or false: a wheel on ball bearings 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 7 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
18. 18.True or false: a rough doormat gives less friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
21. 21.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a wooden plank
23. 23.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) polished marble (d) glass
24. 24.True or false: a wet tiled floor gives less friction. (a) True (b) False
25. 25.True or false: sand on a slippery path gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
29. 29.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
30. 30.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
32. 32.True or false: skating on ice gives more friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
34. 34.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
35. 35.True or false: chalk on a gym bar gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 10 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
37. 37.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
39. 39.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 9 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank

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