Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 172 · 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 wheel on ball bearings gives less friction. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) a box pushed on carpet (d) chalk on a gym bar
3. 3.🛞 Friction acts … (a) with the motion (b) only upwards (c) only on ice (d) against the motion
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 14 N, ice 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a glass sheet 7 N, a wooden plank 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
7. 7.True or false: a grippy rubber sole gives less friction. (a) True (b) False
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
9. 9.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
10. 10.🛞 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 8 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
13. 13.True or false: sand on a slippery path gives less friction. (a) True (b) False
14. 14.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) sandpaper (c) glass (d) ice
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 8 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
16. 16.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 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 8 N, sandpaper 11 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 carpet 6 N, ice 1 N, a glass sheet 3 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 2 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
22. 22.True or false: a smooth steel slide gives more friction. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) a grippy rubber sole (d) sand on a slippery path
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) a smooth steel slide (d) skating on ice
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) oil on a squeaky hinge (d) a grippy rubber sole
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
31. 31.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, ice 4 N, a wooden plank 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) sand on a slippery path (c) oil on a squeaky hinge (d) a wet tiled floor
34. 34.True or false: a tyre with deep treads gives more friction. (a) True (b) False
35. 35.True or false: a box pushed on carpet gives more friction. (a) True (b) False
36. 36.True or false: a wet tiled floor gives less friction. (a) True (b) False
37. 37.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough

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