Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 95 · 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) wet (b) cold (c) magnetic (d) warm
2. 2.True or false: a wet tiled floor gives more friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 2 N, a wooden plank 5 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
4. 4.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
5. 5.True or false: chalk on a gym bar gives more friction. (a) True (b) False
6. 6.True or false: a tyre with deep treads gives less friction. (a) True (b) False
7. 7.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
9. 9.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
11. 11.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
12. 12.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
14. 14.🛞 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 carpet 9 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) skating on ice (d) a wheel on ball bearings
16. 16.True or false: sand on a slippery path gives less friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a rough doormat (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a tyre with deep treads
18. 18.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) sandpaper (d) a wooden plank
21. 21.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
22. 22.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) ice
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 9 N, sandpaper 11 N, a glass sheet 3 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
26. 26.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
27. 27.🛞 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 4 N, sandpaper 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) sandpaper (d) a carpet
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 8 N, sandpaper 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
29. 29.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
30. 30.True or false: a rough doormat gives less friction. (a) False (b) True
31. 31.True or false: a grippy rubber sole gives less friction. (a) True (b) False
32. 32.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
33. 33.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wet tiled floor
34. 34.True or false: powder on a carrom board gives less friction. (a) False (b) True
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
36. 36.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
37. 37.True or false: a wet tiled floor gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a wooden plank 5 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
39. 39.True or false: a smooth steel slide gives less friction. (a) False (b) True
40. 40.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to go slower (c) to look nice (d) to save rubber

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