Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 732 · 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 glass sheet 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
2. 2.🔍 Which is the odd one out? (a) a rough doormat (b) a grippy rubber sole (c) sand on a slippery path (d) a wet tiled floor
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 8 N, ice 4 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
4. 4.True or false: a grippy rubber sole gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
7. 7.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
8. 8.🔍 Which is the odd one out? (a) a rough doormat (b) a box pushed on carpet (c) a smooth steel slide (d) a tyre with deep treads
9. 9.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
10. 10.🛞 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 4 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
11. 11.True or false: a smooth steel slide gives more friction. (a) False (b) True
12. 12.True or false: skating on ice gives less friction. (a) False (b) True
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
15. 15.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
16. 16.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
18. 18.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) oil on a squeaky hinge (d) sand on a slippery path
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) skating on ice (d) a rough doormat
21. 21.True or false: chalk on a gym bar gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
23. 23.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
24. 24.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) powder on a carrom board (d) a smooth steel slide
25. 25.True or false: sand on a slippery path gives less friction. (a) True (b) False
26. 26.True or false: chalk on a gym bar gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) a tyre with deep treads (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a rough doormat
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
29. 29.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
30. 30.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) add sand (c) make parts rough (d) press parts harder
31. 31.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
32. 32.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) chalk on a gym bar (d) sand on a slippery path
33. 33.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 10 N, a carpet 11 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 8 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
36. 36.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
37. 37.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
38. 38.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
39. 39.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
40. 40.🛞 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 carpet 7 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet

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