Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 955 · 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: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a smooth steel slide (d) a rough doormat
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
9. 9.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
10. 10.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
11. 11.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.True or false: a grippy rubber sole gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) glass (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
19. 19.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
20. 20.🛞 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 8 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) a wooden plank
21. 21.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
22. 22.True or false: a box pushed on carpet gives more friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a wheel on ball bearings (d) sand on a slippery path
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
26. 26.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
27. 27.True or false: chalk on a gym bar gives less friction. (a) True (b) False
28. 28.🛞 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 wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
29. 29.True or false: a smooth steel slide gives less friction. (a) False (b) True
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) sand on a slippery path (d) a box pushed on carpet
32. 32.True or false: a grippy rubber sole gives less friction. (a) True (b) False
33. 33.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
34. 34.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
35. 35.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a rough doormat (d) a box pushed on carpet
36. 36.True or false: a tyre with deep treads 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 4 N, a wooden plank 7 N, a carpet 11 N, sandpaper 12 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
39. 39.True or false: powder on a carrom board gives less friction. (a) True (b) False
40. 40.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm

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