Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 675 · 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.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
4. 4.🛞 Friction acts … (a) with the motion (b) only upwards (c) against the motion (d) only on ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
7. 7.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a rough doormat (d) powder on a carrom board
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
11. 11.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 10 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
15. 15.True or false: sand on a slippery path gives less friction. (a) False (b) True
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
18. 18.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
20. 20.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a smooth steel slide (c) oil on a squeaky hinge (d) skating on ice
21. 21.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
22. 22.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a box pushed on carpet
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a box pushed on carpet (d) powder on a carrom board
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) chalk on a gym bar (d) a grippy rubber sole
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 7 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
27. 27.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
29. 29.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a tyre with deep treads (d) a box pushed on carpet
30. 30.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) sandpaper (c) polished marble (d) ice
31. 31.True or false: a rough doormat gives less friction. (a) False (b) True
32. 32.🛞 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 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
33. 33.🛞 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 carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
34. 34.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a grippy rubber sole (d) a wheel on ball bearings
35. 35.True or false: a tyre with deep treads gives less friction. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a tyre with deep treads (d) skating on ice
37. 37.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 1 N, a glass sheet 4 N, a carpet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
39. 39.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
40. 40.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem

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