Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 805 · 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 wooden plank 8 N, sandpaper 11 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 7 N, a carpet 8 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
5. 5.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a tyre with deep treads
6. 6.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) powder on a carrom board (d) skating on ice
7. 7.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) oil on a squeaky hinge (d) skating on ice
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, a glass sheet 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) sandpaper (d) ice
10. 10.🛞 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, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
11. 11.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) oil on a squeaky hinge (d) skating on ice
12. 12.True or false: a smooth steel slide gives more friction. (a) False (b) True
13. 13.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
14. 14.True or false: a wet tiled floor gives less friction. (a) True (b) False
15. 15.🛞 Friction acts … (a) only upwards (b) against the motion (c) only on ice (d) with the motion
16. 16.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a box pushed on carpet (c) a rough doormat (d) a wheel on ball bearings
18. 18.🛞 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 5 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
19. 19.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 10 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a wooden plank 8 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) ice (d) sandpaper
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
23. 23.True or false: a rough doormat gives less friction. (a) True (b) False
24. 24.🔍 Which is the odd one out? (a) sand on a slippery path (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a box pushed on carpet
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 3 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, ice 4 N, a glass sheet 5 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
30. 30.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
31. 31.True or false: a wet tiled floor gives more friction. (a) False (b) True
32. 32.True or false: a rough doormat gives more friction. (a) False (b) True
33. 33.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
34. 34.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a box pushed on carpet (d) sand on a slippery path
35. 35.True or false: skating on ice gives more friction. (a) True (b) False
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 8 N, ice 1 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: sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
38. 38.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
39. 39.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
40. 40.🔍 Which is the odd one out? (a) a grippy rubber sole (b) sand on a slippery path (c) a box pushed on carpet (d) a smooth steel slide

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