Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 396 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
2. 2.True or false: sand on a slippery path gives more friction. (a) False (b) True
3. 3.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
4. 4.True or false: a grippy rubber sole gives more friction. (a) False (b) True
5. 5.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
7. 7.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
8. 8.True or false: a rough doormat gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 11 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) a wet tiled floor (b) a tyre with deep treads (c) a box pushed on carpet (d) chalk on a gym bar
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
12. 12.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
17. 17.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a grippy rubber sole (d) powder on a carrom board
19. 19.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) a wheel on ball bearings (d) oil on a squeaky hinge
20. 20.True or false: a wet tiled floor gives less friction. (a) False (b) True
21. 21.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
22. 22.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
23. 23.🛞 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 11 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
24. 24.True or false: a smooth steel slide gives less friction. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a rough doormat (d) skating on ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 10 N, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
29. 29.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
30. 30.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 4 N, a wooden plank 5 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on a carpet than on ice?
33. 33.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) chalk on a gym bar (d) oil on a squeaky hinge
34. 34.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
35. 35.True or false: a grippy rubber sole gives less friction. (a) False (b) True
36. 36.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
37. 37.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) skating on ice
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
40. 40.True or false: powder on a carrom board gives more friction. (a) True (b) False

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