Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 55 · 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.True or false: a wet tiled floor gives less friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
3. 3.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
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 6 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
5. 5.🔍 Which is the odd one out? (a) a tyre with deep treads (b) sand on a slippery path (c) chalk on a gym bar (d) oil on a squeaky hinge
6. 6.🛞 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 14 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
7. 7.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
8. 8.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
12. 12.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
13. 13.True or false: skating on ice gives less friction. (a) False (b) True
14. 14.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a smooth steel slide (d) a wheel on ball bearings
16. 16.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
17. 17.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 10 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
22. 22.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) skating on ice (d) a rough doormat
24. 24.🛞 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 wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a wooden plank 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) sandpaper
26. 26.🛞 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 carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
27. 27.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 13 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on a carpet than on ice?
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
33. 33.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
34. 34.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
35. 35.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
36. 36.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
37. 37.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) a rough doormat (d) a smooth steel slide
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) a tyre with deep treads (d) oil on a squeaky hinge
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
40. 40.True or false: a wet tiled floor gives more friction. (a) True (b) False

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