Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 152 · 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.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
2. 2.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a wooden plank 12 N, sandpaper 13 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
4. 4.True or false: a wet tiled floor gives more friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 8 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
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, ice 3 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
7. 7.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
8. 8.True or false: a box pushed on carpet gives less friction. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) a rough doormat (d) a wet tiled floor
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) ice (d) sandpaper
12. 12.True or false: a box pushed on carpet gives more friction. (a) False (b) True
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
15. 15.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. How many newtons more were needed on a carpet than on ice?
17. 17.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
18. 18.True or false: a grippy rubber sole gives less friction. (a) False (b) True
19. 19.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
20. 20.🛞 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 most friction? (a) ice (b) sandpaper (c) a glass sheet (d) a carpet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 8 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
22. 22.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
23. 23.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 9 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 5 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
28. 28.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a rough doormat (c) a wheel on ball bearings (d) a smooth steel slide
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a grippy rubber sole (d) a smooth steel slide
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 4 N, sandpaper 6 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.True or false: a rough doormat gives less friction. (a) True (b) False
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 5 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, sandpaper 9 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 5 N, sandpaper 6 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) chalk on a gym bar (d) a box pushed on carpet
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) chalk on a gym bar (c) a grippy rubber sole (d) sand on a slippery path
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?

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