Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 254 · 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.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
4. 4.True or false: a box pushed on carpet gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 12 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 5 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
8. 8.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
9. 9.True or false: sand on a slippery path gives more friction. (a) False (b) True
10. 10.True or false: sand on a slippery path gives less friction. (a) False (b) True
11. 11.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, ice 3 N, a glass sheet 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
13. 13.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to save rubber (d) to look nice
14. 14.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a wheel on ball bearings (d) oil on a squeaky hinge
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 16 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
18. 18.True or false: a wet tiled floor gives more friction. (a) True (b) False
19. 19.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a tyre with deep treads (d) a rough doormat
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.True or false: chalk on a gym bar gives more friction. (a) False (b) True
23. 23.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.True or false: a grippy rubber sole gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
27. 27.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.🛞 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 carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
31. 31.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
33. 33.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a wet tiled floor (d) chalk on a gym bar
34. 34.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, ice 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
36. 36.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
37. 37.🛞 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 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 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 8 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.True or false: a smooth steel slide gives less friction. (a) False (b) True

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