Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 403 · 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 7 N, sandpaper 8 N, ice 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
2. 2.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
3. 3.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough
4. 4.True or false: a rough doormat gives less friction. (a) True (b) False
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
7. 7.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
8. 8.True or false: a smooth steel slide gives less friction. (a) False (b) True
9. 9.🛞 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 12 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) a tyre with deep treads (d) oil on a squeaky hinge
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 7 N, sandpaper 11 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
12. 12.True or false: skating on ice gives less friction. (a) True (b) False
13. 13.True or false: powder on a carrom board gives more friction. (a) True (b) False
14. 14.True or false: sand on a slippery path gives less friction. (a) True (b) False
15. 15.True or false: a box pushed on carpet gives more friction. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a wet tiled floor (d) a rough doormat
17. 17.🛞 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 carpet 8 N, sandpaper 11 N. How many newtons more were needed on sandpaper than on ice?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) sandpaper
19. 19.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
20. 20.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
21. 21.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a tyre with deep treads (d) a smooth steel slide
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
23. 23.🛞 Friction acts … (a) only on ice (b) against the motion (c) only upwards (d) with the motion
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
25. 25.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) sandpaper
27. 27.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
28. 28.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
29. 29.🛞 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 7 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
30. 30.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to grip the road (d) to save rubber
31. 31.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
32. 32.🔍 Which is the odd one out? (a) a grippy rubber sole (b) skating on ice (c) sand on a slippery path (d) chalk on a gym bar
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.True or false: a smooth steel slide gives more friction. (a) False (b) True
35. 35.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
36. 36.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
37. 37.True or false: powder on a carrom board gives less friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
39. 39.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 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