Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 834 · 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.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to look nice (d) to grip the road
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
4. 4.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
5. 5.True or false: a rough doormat gives more friction. (a) True (b) False
6. 6.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
7. 7.🛞 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 9 N, sandpaper 12 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 12 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, ice 1 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a rough doormat
12. 12.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
13. 13.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) a smooth steel slide
14. 14.🛞 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 wooden plank 9 N, a carpet 11 N. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
17. 17.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
19. 19.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
20. 20.True or false: a box pushed on carpet gives less friction. (a) False (b) True
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
22. 22.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a wheel on ball bearings
23. 23.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
24. 24.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
25. 25.True or false: a grippy rubber sole gives more friction. (a) True (b) False
26. 26.True or false: sand on a slippery path gives less friction. (a) True (b) False
27. 27.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
28. 28.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) a carpet
30. 30.True or false: chalk on a gym bar gives less friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
33. 33.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) a rough doormat (d) a wheel on ball bearings
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) ice (d) sandpaper
36. 36.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
37. 37.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a rough doormat (d) powder on a carrom board
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
40. 40.True or false: skating on ice gives less friction. (a) True (b) False

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