Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 167 · 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.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 1 N, a wooden plank 4 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
4. 4.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 6 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 5 N, a wooden plank 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a glass sheet (d) sandpaper
8. 8.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
9. 9.True or false: a wet tiled floor gives more friction. (a) True (b) False
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) glass (d) sandpaper
11. 11.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to grip the road (d) to go slower
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 5 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) ice (c) sandpaper (d) a glass sheet
13. 13.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
14. 14.True or false: skating on ice gives less friction. (a) False (b) True
15. 15.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
16. 16.True or false: skating on ice gives more friction. (a) False (b) True
17. 17.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.True or false: a box pushed on carpet gives less friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, sandpaper 13 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 2 N, a wooden plank 3 N. How many newtons more were needed on sandpaper than on ice?
22. 22.True or false: sand on a slippery path gives more friction. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) powder on a carrom board (d) chalk on a gym bar
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a box pushed on carpet (c) sand on a slippery path (d) a wheel on ball bearings
25. 25.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) powder on a carrom board (d) sand on a slippery path
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 7 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
27. 27.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) sand on a slippery path (d) a smooth steel slide
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 9 N, ice 2 N, a glass sheet 6 N. How many newtons more were needed on a carpet than on ice?
30. 30.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
31. 31.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
32. 32.🛞 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 carpet 6 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on ice?
33. 33.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
34. 34.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
35. 35.🛞 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 8 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
36. 36.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
37. 37.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
38. 38.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 3 N, sandpaper 4 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?

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