Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 875 · 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 glass sheet 5 N, a wooden plank 7 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
4. 4.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) skating on ice (d) a wet tiled floor
5. 5.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
6. 6.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) powder on a carrom board (d) a box pushed on carpet
7. 7.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
8. 8.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
9. 9.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
10. 10.🛞 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, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
11. 11.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a grippy rubber sole (d) a wheel on ball bearings
12. 12.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a smooth steel slide (d) oil on a squeaky hinge
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a carpet 3 N, sandpaper 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
14. 14.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) a tyre with deep treads (d) sand on a slippery path
16. 16.True or false: a tyre with deep treads gives more 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 2 N, a wooden plank 6 N, a carpet 10 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
18. 18.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
19. 19.🔍 Which is the odd one out? (a) a smooth steel slide (b) a rough doormat (c) skating on ice (d) oil on a squeaky hinge
20. 20.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
21. 21.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) skating on ice (d) chalk on a gym bar
23. 23.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
24. 24.True or false: sand on a slippery path gives less friction. (a) True (b) False
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
27. 27.True or false: a rough doormat gives more friction. (a) False (b) True
28. 28.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
29. 29.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 8 N, sandpaper 12 N, ice 4 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
31. 31.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) skating on ice (d) powder on a carrom board
32. 32.True or false: a smooth steel slide gives less friction. (a) False (b) True
33. 33.🛞 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 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🛞 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 6 N, a carpet 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
36. 36.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
39. 39.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a wheel on ball bearings (d) a tyre with deep treads
40. 40.🛞 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 6 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper

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