Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 845 · 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: ice 2 N, a wooden plank 3 N, a carpet 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, sandpaper 13 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) ice
3. 3.True or false: powder on a carrom board gives more friction. (a) False (b) True
4. 4.True or false: a box pushed on carpet gives more friction. (a) True (b) False
5. 5.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a smooth steel slide (d) a grippy rubber sole
7. 7.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) a smooth steel slide (b) powder on a carrom board (c) a wheel on ball bearings (d) a rough doormat
9. 9.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
10. 10.True or false: a wet tiled floor gives less friction. (a) True (b) False
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 2 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
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: shoe soles wearing out? (a) helpful (b) a problem
14. 14.True or false: skating on ice gives less friction. (a) True (b) False
15. 15.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
16. 16.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
17. 17.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 6 N, ice 1 N, a glass sheet 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
19. 19.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
20. 20.True or false: a box pushed on carpet gives less friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
22. 22.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
24. 24.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, sandpaper 9 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
29. 29.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a box pushed on carpet (c) chalk on a gym bar (d) a grippy rubber sole
31. 31.True or false: powder on a carrom board gives less friction. (a) False (b) True
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.True or false: sand on a slippery path gives less friction. (a) True (b) False
34. 34.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
35. 35.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 8 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a carpet 4 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
39. 39.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) powder on a carrom board (c) a smooth steel slide (d) sand on a slippery path
40. 40.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) skating on ice (d) a grippy rubber sole

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