Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 552 · 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 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 10 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) a box pushed on carpet (d) skating on ice
4. 4.🛞 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, sandpaper 7 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
5. 5.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
6. 6.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) press parts harder (d) oil the moving parts
7. 7.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
8. 8.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
9. 9.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a smooth steel slide (d) chalk on a gym bar
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
11. 11.True or false: skating on ice gives more friction. (a) True (b) False
12. 12.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
13. 13.True or false: a smooth steel slide gives more friction. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) a smooth steel slide (b) oil on a squeaky hinge (c) powder on a carrom board (d) sand on a slippery path
15. 15.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
16. 16.🛞 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. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 1 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
20. 20.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
21. 21.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
22. 22.True or false: a rough doormat gives more friction. (a) False (b) True
23. 23.True or false: a grippy rubber sole gives more friction. (a) False (b) True
24. 24.True or false: a grippy rubber sole gives less friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) sand on a slippery path (d) a grippy rubber sole
26. 26.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
27. 27.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) chalk on a gym bar (d) a rough doormat
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
32. 32.True or false: sand on a slippery path gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a rough doormat (d) a wheel on ball bearings
35. 35.True or false: chalk on a gym bar gives less friction. (a) False (b) True
36. 36.🛞 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 carpet 10 N, sandpaper 14 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
37. 37.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a grippy rubber sole (d) a tyre with deep treads
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 13 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 11 N, ice 3 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?

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