Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 100 · 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.True or false: a rough doormat gives less friction. (a) False (b) True
2. 2.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
3. 3.🛞 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 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 1 N, a glass sheet 4 N, a wooden plank 8 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
5. 5.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
6. 6.True or false: a wet tiled floor gives less friction. (a) False (b) True
7. 7.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 2 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) ice
9. 9.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
10. 10.True or false: skating on ice gives less friction. (a) False (b) True
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, ice 1 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
12. 12.🛞 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 6 N, a carpet 10 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a carpet (d) a wooden plank
13. 13.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
16. 16.True or false: chalk on a gym bar gives more friction. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a wet tiled floor (c) sand on a slippery path (d) a rough doormat
18. 18.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a tyre with deep treads (d) oil on a squeaky hinge
19. 19.True or false: a grippy rubber sole gives less friction. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) a box pushed on carpet (b) chalk on a gym bar (c) a rough doormat (d) skating on ice
21. 21.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a rough doormat (d) a smooth steel slide
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.🛞 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 10 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
25. 25.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) oil the moving parts (d) press parts harder
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 4 N, a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
28. 28.True or false: a box pushed on carpet gives more friction. (a) True (b) False
29. 29.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) a rough doormat (b) powder on a carrom board (c) a wheel on ball bearings (d) a wet tiled floor
31. 31.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 7 N, a glass sheet 1 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) chalk on a gym bar (d) a wheel on ball bearings
35. 35.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a wooden plank 5 N, a carpet 7 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: a carpet 4 N, sandpaper 5 N, ice 1 N, a glass sheet 3 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) ice
38. 38.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
39. 39.🛞 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 6 N, a carpet 8 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) a wooden plank
40. 40.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a wheel on ball bearings (d) chalk on a gym bar

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