Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 421 · 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.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
2. 2.True or false: a rough doormat 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: sandpaper 7 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) ice
4. 4.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
6. 6.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wet tiled floor (c) oil on a squeaky hinge (d) powder on a carrom board
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) powder on a carrom board (c) a grippy rubber sole (d) a rough doormat
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) less friction (b) more friction
11. 11.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
12. 12.True or false: sand on a slippery path gives more friction. (a) True (b) False
13. 13.True or false: a grippy rubber sole gives more friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 Rubbing your hands fast makes them … (a) wet (b) cold (c) magnetic (d) warm
17. 17.True or false: a grippy rubber sole gives less friction. (a) True (b) False
18. 18.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) sandpaper
21. 21.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
22. 22.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wet tiled floor (c) a smooth steel slide (d) a tyre with deep treads
24. 24.🛞 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, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (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: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 10 N. How many newtons more were needed on a carpet than on ice?
26. 26.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
28. 28.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a tyre with deep treads (d) a wheel on ball bearings
29. 29.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.True or false: a tyre with deep treads gives less friction. (a) False (b) True
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
34. 34.🔍 Which is the odd one out? (a) powder on a carrom board (b) a rough doormat (c) skating on ice (d) a wheel on ball bearings
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a tyre with deep treads (d) a grippy rubber sole
36. 36.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a rough doormat (d) sand on a slippery path
37. 37.🛞 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 wooden plank 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. How many newtons more were needed on sandpaper than on ice?

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