Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 741 · 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.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
2. 2.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
3. 3.True or false: a smooth steel slide gives more friction. (a) False (b) True
4. 4.🛞 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 5 N, a wooden plank 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a wooden plank
5. 5.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
6. 6.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 Friction acts … (a) with the motion (b) against the motion (c) only on ice (d) only upwards
9. 9.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
10. 10.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
11. 11.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 4 N, a carpet 5 N, sandpaper 7 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
13. 13.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
14. 14.True or false: a tyre with deep treads gives less friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
16. 16.True or false: skating on ice gives more friction. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) a wet tiled floor (b) powder on a carrom board (c) a box pushed on carpet (d) skating on ice
18. 18.True or false: a box pushed on carpet gives more friction. (a) True (b) False
19. 19.True or false: a wet tiled floor gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
21. 21.True or false: a tyre with deep treads 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: a carpet 8 N, sandpaper 12 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
23. 23.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
24. 24.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
25. 25.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 6 N, sandpaper 7 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
27. 27.🛞 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 10 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, a carpet 10 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 1 N, a wooden plank 4 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) ice
31. 31.True or false: a rough doormat gives less friction. (a) False (b) True
32. 32.True or false: powder on a carrom board gives less friction. (a) True (b) False
33. 33.True or false: a wet tiled floor gives more friction. (a) True (b) False
34. 34.True or false: a box pushed on carpet gives less friction. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a smooth steel slide (d) sand on a slippery path
36. 36.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
37. 37.True or false: sand on a slippery path gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 11 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
39. 39.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 3 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?

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