Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 128 · 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: striking a matchstick? (a) a problem (b) helpful
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.🛞 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 carpet 10 N, sandpaper 11 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
6. 6.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
7. 7.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wheel on ball bearings (d) powder on a carrom board
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) a grippy rubber sole (d) sand on a slippery path
9. 9.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a rough doormat (d) oil on a squeaky hinge
10. 10.🛞 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 11 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on a glass sheet?
11. 11.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
12. 12.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
13. 13.🛞 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 12 N, ice 3 N. How many newtons more were needed on a carpet than on ice?
14. 14.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
16. 16.🛞 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 carpet 9 N, sandpaper 10 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
17. 17.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) powder on a carrom board (d) chalk on a gym bar
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
19. 19.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
22. 22.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 1 N, a wooden plank 3 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
24. 24.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
25. 25.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
26. 26.True or false: a smooth steel slide gives less friction. (a) False (b) True
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 7 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
29. 29.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) sand on a slippery path (c) a smooth steel slide (d) a wet tiled floor
30. 30.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
31. 31.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, sandpaper 6 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 14 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.True or false: skating on ice 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.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 6 N, sandpaper 9 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper

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