Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 82 · 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.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) ice (c) sandpaper (d) glass
2. 2.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
3. 3.🛞 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 7 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
4. 4.True or false: sand on a slippery path gives less friction. (a) True (b) False
5. 5.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
6. 6.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) a wheel on ball bearings (d) sand on a slippery path
7. 7.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) helpful (b) a problem
8. 8.🔍 Which is the odd one out? (a) a wet tiled floor (b) a grippy rubber sole (c) sand on a slippery path (d) a rough doormat
9. 9.True or false: a box pushed on carpet gives less friction. (a) False (b) True
10. 10.True or false: a tyre with deep treads gives less friction. (a) False (b) True
11. 11.True or false: a smooth steel slide gives more friction. (a) True (b) False
12. 12.True or false: powder on a carrom board gives more friction. (a) True (b) False
13. 13.True or false: powder on a carrom board gives less friction. (a) False (b) True
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
15. 15.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
16. 16.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
17. 17.🔍 Which is the odd one out? (a) chalk on a gym bar (b) skating on ice (c) a tyre with deep treads (d) a rough doormat
18. 18.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) make parts rough (d) add sand
19. 19.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
20. 20.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) skating on ice (c) a tyre with deep treads (d) powder on a carrom board
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 3 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
24. 24.True or false: a grippy rubber sole gives more friction. (a) True (b) False
25. 25.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 5 N, a wooden plank 8 N, a carpet 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
27. 27.🛞 Rubbing your hands fast makes them … (a) magnetic (b) cold (c) wet (d) warm
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 4 N, a wooden plank 8 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
29. 29.True or false: a box pushed on carpet gives more friction. (a) True (b) False
30. 30.True or false: a tyre with deep treads gives more friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a smooth steel slide (d) a wheel on ball bearings
32. 32.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, a carpet 9 N, sandpaper 12 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 2 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 11 N, sandpaper 12 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
36. 36.True or false: a grippy rubber sole gives less friction. (a) True (b) False
37. 37.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
38. 38.🔍 Which is the odd one out? (a) chalk on a gym bar (b) powder on a carrom board (c) sand on a slippery path (d) a box pushed on carpet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?

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