Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 426 · 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: a wooden plank 3 N, a carpet 4 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) ice
2. 2.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
3. 3.🛞 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 12 N, a glass sheet 3 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: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a wooden plank
5. 5.True or false: a grippy rubber sole 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 glass sheet 1 N, a wooden plank 3 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
8. 8.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wet tiled floor (d) powder on a carrom board
9. 9.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
11. 11.True or false: a rough doormat gives less friction. (a) True (b) False
12. 12.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
14. 14.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) oil on a squeaky hinge (d) chalk on a gym bar
15. 15.True or false: skating on ice gives less friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) a grippy rubber sole (d) oil on a squeaky hinge
17. 17.True or false: powder on a carrom board gives less friction. (a) True (b) False
18. 18.True or false: chalk on a gym bar gives more friction. (a) True (b) False
19. 19.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) press parts harder (d) add sand
20. 20.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a rough doormat (d) a wheel on ball bearings
21. 21.🛞 Why are tyres made with deep treads? (a) to go slower (b) to grip the road (c) to look nice (d) to save rubber
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 10 N, sandpaper 14 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, sandpaper 9 N, ice 3 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, ice 1 N, a wooden plank 2 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
25. 25.🛞 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 10 N, sandpaper 14 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
26. 26.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) magnetic (d) wet
27. 27.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
28. 28.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, a glass sheet 1 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 9 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
32. 32.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
33. 33.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
34. 34.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a smooth steel slide
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 9 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 3 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet

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