Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 459 · 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.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
2. 2.True or false: chalk on a gym bar gives more friction. (a) True (b) False
3. 3.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
4. 4.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a smooth steel slide (d) a wheel on ball bearings
5. 5.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a grippy rubber sole (d) a box pushed on carpet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
9. 9.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
12. 12.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
13. 13.True or false: skating on ice gives less friction. (a) False (b) True
14. 14.True or false: a rough doormat gives more friction. (a) False (b) True
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
16. 16.True or false: sand on a slippery path gives less friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
18. 18.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) sand on a slippery path (d) chalk on a gym bar
19. 19.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
20. 20.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
21. 21.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
22. 22.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) a smooth steel slide (d) a wet tiled floor
24. 24.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
25. 25.True or false: a wet tiled floor gives more friction. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a smooth steel slide (d) oil on a squeaky hinge
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 13 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
29. 29.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
30. 30.True or false: sand on a slippery path gives more friction. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a rough doormat (c) chalk on a gym bar (d) a grippy rubber sole
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, sandpaper 9 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
34. 34.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.True or false: a tyre with deep treads gives more friction. (a) True (b) False
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: a grippy rubber sole gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) powder on a carrom board (d) a grippy rubber sole
40. 40.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful

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