Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 86 · 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 5 N, a carpet 8 N, sandpaper 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
3. 3.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
4. 4.True or false: a smooth steel slide gives less friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 6 N, a wooden plank 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
6. 6.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
7. 7.🛞 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, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a wooden plank
8. 8.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
9. 9.True or false: a smooth steel slide gives more friction. (a) False (b) True
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 7 N, ice 1 N, a glass sheet 3 N. How many newtons more were needed on sandpaper than on ice?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
12. 12.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
13. 13.🛞 Friction acts … (a) only on ice (b) only upwards (c) with the motion (d) against the motion
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
16. 16.True or false: sand on a slippery path gives more friction. (a) True (b) False
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a glass sheet 4 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
21. 21.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
22. 22.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) sand on a slippery path (d) chalk on a gym bar
23. 23.🛞 More or less friction: sand on a slippery path? (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) a rough doormat (d) chalk on a gym bar
25. 25.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
26. 26.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
27. 27.🛞 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 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🛞 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 10 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
29. 29.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
32. 32.🔍 Which is the odd one out? (a) powder on a carrom board (b) a smooth steel slide (c) a rough doormat (d) oil on a squeaky hinge
33. 33.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
34. 34.True or false: skating on ice gives more friction. (a) True (b) False
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 8 N, ice 2 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
36. 36.True or false: a grippy rubber sole gives more friction. (a) True (b) False
37. 37.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
38. 38.True or false: sand on a slippery path gives less friction. (a) False (b) True
39. 39.True or false: a wet tiled floor 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 wooden plank 7 N, a carpet 11 N, sandpaper 13 N, a glass sheet 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) a wooden plank

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