Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 62 · 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 smooth steel slide? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
3. 3.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to go slower (d) to save rubber
4. 4.🛞 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 carpet 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
5. 5.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
7. 7.True or false: powder on a carrom board gives more friction. (a) True (b) False
8. 8.True or false: powder on a carrom board gives less friction. (a) False (b) True
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) polished marble (d) sandpaper
10. 10.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
11. 11.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
12. 12.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) warm (d) cold
13. 13.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) chalk on a gym bar (d) a rough doormat
14. 14.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
15. 15.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
16. 16.🛞 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, sandpaper 4 N, ice 1 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a glass sheet (d) a wooden plank
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) a wheel on ball bearings (d) a rough doormat
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
19. 19.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) chalk on a gym bar (d) a wet tiled floor
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a box pushed on carpet (d) skating on ice
21. 21.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
23. 23.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
24. 24.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
26. 26.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a tyre with deep treads (c) a rough doormat (d) a box pushed on carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
29. 29.🛞 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, ice 3 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🔍 Which is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a wheel on ball bearings (d) a smooth steel slide
31. 31.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) sand on a slippery path (d) chalk on a gym bar
32. 32.True or false: sand on a slippery path gives more friction. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a rough doormat (d) oil on a squeaky hinge
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.True or false: chalk on a gym bar gives more friction. (a) False (b) True
36. 36.True or false: a wet tiled floor 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 4 N, a wooden plank 5 N, a carpet 6 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
38. 38.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a rough doormat (d) a smooth steel slide
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction

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