Engineering Worksheet: Friction

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

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