Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 653 · 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 4 N, a glass sheet 5 N, a carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) powder on a carrom board (d) oil on a squeaky hinge
3. 3.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
4. 4.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
5. 5.True or false: a smooth steel slide gives more friction. (a) False (b) True
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) ice
7. 7.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold
8. 8.True or false: skating on ice gives more friction. (a) False (b) True
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a carpet 10 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a rough doormat (d) a grippy rubber sole
12. 12.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to look nice (c) to go slower (d) to grip the road
13. 13.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
14. 14.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 11 N, a carpet 15 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
17. 17.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
19. 19.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 7 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
21. 21.True or false: chalk on a gym bar gives less friction. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a wheel on ball bearings (d) a tyre with deep treads
23. 23.🛞 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, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
26. 26.True or false: a grippy rubber sole 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: ice 2 N, a glass sheet 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) oil on a squeaky hinge (d) a grippy rubber sole
29. 29.🛞 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 5 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
30. 30.True or false: a box pushed on carpet gives less friction. (a) False (b) True
31. 31.True or false: a tyre with deep treads gives more friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 11 N, ice 4 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a glass sheet
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) a smooth steel slide (d) chalk on a gym bar
35. 35.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
36. 36.🛞 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 7 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
37. 37.True or false: sand on a slippery path gives more friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem

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