Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 463 · 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 is the odd one out? (a) a wet tiled floor (b) sand on a slippery path (c) a box pushed on carpet (d) a grippy rubber sole
2. 2.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
3. 3.True or false: a wet tiled floor gives more friction. (a) True (b) False
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) cold (d) wet
6. 6.🛞 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 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
7. 7.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, ice 1 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) a grippy rubber sole
10. 10.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
11. 11.🛞 More or less friction: a wet tiled floor? (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 4 N, sandpaper 5 N, ice 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
13. 13.True or false: a tyre with deep treads gives more friction. (a) True (b) False
14. 14.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
15. 15.True or false: chalk on a gym bar gives more friction. (a) True (b) False
16. 16.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
17. 17.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) a smooth steel slide (d) a tyre with deep treads
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 6 N, a carpet 10 N, sandpaper 14 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🔍 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) skating on ice
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a rough doormat (d) a wheel on ball bearings
21. 21.True or false: a grippy rubber sole gives more friction. (a) False (b) True
22. 22.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
23. 23.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) skating on ice (d) powder on a carrom board
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 3 N, a carpet 7 N. Which surface gave the most 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 carpet 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 10 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) a carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a wooden plank
27. 27.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 2 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
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 10 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
31. 31.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
34. 34.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
37. 37.True or false: a box pushed on carpet gives more friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?

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