Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 353 · 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.🛞 How can we reduce friction in a machine? (a) add sand (b) make parts rough (c) oil the moving parts (d) press parts harder
2. 2.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a box pushed on carpet (c) chalk on a gym bar (d) a smooth steel slide
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 2 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
4. 4.🛞 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. How many newtons more were needed on a carpet than on ice?
5. 5.True or false: a box pushed on carpet gives less friction. (a) False (b) True
6. 6.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
8. 8.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
9. 9.True or false: skating on ice gives less friction. (a) True (b) False
10. 10.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
11. 11.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a box pushed on carpet (d) oil on a squeaky hinge
12. 12.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
13. 13.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) chalk on a gym bar (c) skating on ice (d) a wet tiled floor
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, sandpaper 13 N, ice 2 N, a glass sheet 6 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
16. 16.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
17. 17.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
22. 22.True or false: chalk on a gym bar gives more friction. (a) True (b) False
23. 23.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
24. 24.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
25. 25.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) chalk on a gym bar (c) a wheel on ball bearings (d) sand on a slippery path
27. 27.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
28. 28.True or false: a grippy rubber sole gives more friction. (a) False (b) True
29. 29.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
30. 30.🔍 Which is the odd one out? (a) chalk on a gym bar (b) sand on a slippery path (c) a box pushed on carpet (d) a wet tiled floor
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
32. 32.🛞 Why are tyres made with deep treads? (a) to go slower (b) to save rubber (c) to grip the road (d) to look nice
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 16 N, ice 4 N, a glass sheet 8 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, sandpaper 14 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 2 N, a glass sheet 4 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 wooden plank 6 N, a carpet 9 N, sandpaper 13 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 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 7 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
40. 40.True or false: a box pushed on carpet gives more friction. (a) False (b) True

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