Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 124 · 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 carpet 7 N, sandpaper 8 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 2 N, a carpet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
4. 4.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
5. 5.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) sandpaper (c) glass (d) polished marble
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
7. 7.🛞 Rubbing your hands fast makes them … (a) warm (b) wet (c) cold (d) magnetic
8. 8.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
9. 9.🛞 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 6 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a grippy rubber sole (c) sand on a slippery path (d) a wheel on ball bearings
14. 14.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
15. 15.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
17. 17.True or false: chalk on a gym bar gives more friction. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) sand on a slippery path
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🔍 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 grippy rubber sole
22. 22.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
23. 23.🔍 Which is the odd one out? (a) a smooth steel slide (b) a tyre with deep treads (c) skating on ice (d) a wet tiled floor
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
26. 26.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
27. 27.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
30. 30.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
31. 31.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
32. 32.🔍 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 grippy rubber sole
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 12 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 5 N, sandpaper 7 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
37. 37.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
38. 38.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) sand on a slippery path (d) a rough doormat
40. 40.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) oil on a squeaky hinge (d) powder on a carrom board

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