Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 433 · 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: ice 3 N, a glass sheet 5 N, a wooden plank 9 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
3. 3.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to go slower (d) to save rubber
4. 4.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
5. 5.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
6. 6.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
8. 8.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
9. 9.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
10. 10.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
11. 11.True or false: a wet tiled floor gives less friction. (a) True (b) False
12. 12.True or false: a grippy rubber sole gives less friction. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a smooth steel slide (d) a wet tiled floor
14. 14.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) a box pushed on carpet (d) a tyre with deep treads
15. 15.True or false: skating on ice gives less friction. (a) False (b) True
16. 16.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
17. 17.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
18. 18.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) press parts harder (d) make parts rough
19. 19.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, ice 1 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 More or less friction: oil on a squeaky hinge? (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 carpet 7 N, sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
24. 24.True or false: chalk on a gym bar gives less friction. (a) True (b) False
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
26. 26.True or false: a rough doormat gives more friction. (a) False (b) True
27. 27.🛞 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 11 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) oil on a squeaky hinge (c) sand on a slippery path (d) a grippy rubber sole
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
34. 34.True or false: a rough doormat gives less friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 6 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank
36. 36.True or false: a box pushed on carpet gives more friction. (a) False (b) True
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 8 N, a wooden plank 11 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) powder on a carrom board (d) sand on a slippery path
39. 39.🔍 Which is the odd one out? (a) a smooth steel slide (b) a grippy rubber sole (c) a tyre with deep treads (d) a rough doormat
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction

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