Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 515 · 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.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
3. 3.🛞 Friction acts … (a) only on ice (b) only upwards (c) against the motion (d) with the motion
4. 4.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
5. 5.True or false: a rough doormat gives more friction. (a) False (b) True
6. 6.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
7. 7.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
8. 8.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 8 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
11. 11.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
12. 12.🛞 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) a carpet (b) a wooden plank (c) a glass sheet (d) ice
13. 13.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
14. 14.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
16. 16.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a tyre with deep treads (d) powder on a carrom board
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 9 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 wooden plank 7 N, a carpet 10 N, sandpaper 14 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
20. 20.🛞 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 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, sandpaper 9 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
23. 23.True or false: a wet tiled floor gives more friction. (a) True (b) False
24. 24.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
26. 26.True or false: a grippy rubber sole gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) powder on a carrom board (b) a wet tiled floor (c) oil on a squeaky hinge (d) chalk on a gym bar
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
31. 31.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) powder on a carrom board (d) a grippy rubber sole
32. 32.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
33. 33.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) oil on a squeaky hinge (d) a rough doormat
35. 35.🛞 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 5 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
37. 37.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a carpet 9 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?

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