Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 611 · 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: brakes stopping a cycle? (a) a problem (b) helpful
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
5. 5.🛞 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 4 N, sandpaper 6 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
6. 6.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
8. 8.🛞 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 7 N, sandpaper 8 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
9. 9.True or false: a wet tiled floor gives less friction. (a) True (b) False
10. 10.🛞 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 9 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a grippy rubber sole (d) a wet tiled floor
12. 12.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
13. 13.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 10 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
16. 16.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
18. 18.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) a tyre with deep treads
19. 19.True or false: a grippy rubber sole gives more friction. (a) True (b) False
20. 20.True or false: a tyre with deep treads gives less friction. (a) True (b) False
21. 21.True or false: sand on a slippery path gives more friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 6 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
23. 23.True or false: a rough doormat gives more friction. (a) False (b) True
24. 24.True or false: a grippy rubber sole gives less friction. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) sand on a slippery path (b) a smooth steel slide (c) a box pushed on carpet (d) a rough doormat
26. 26.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
27. 27.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
28. 28.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
29. 29.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) a wet tiled floor (d) chalk on a gym bar
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 5 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
31. 31.🛞 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, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
32. 32.🛞 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 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
33. 33.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
34. 34.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
35. 35.🛞 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 1 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
36. 36.🛞 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 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
37. 37.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) ice (d) polished marble
38. 38.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
39. 39.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids