Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 89 · 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.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 4 N, a glass sheet 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
4. 4.True or false: a box pushed on carpet gives less friction. (a) False (b) True
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 9 N, sandpaper 13 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
6. 6.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
11. 11.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
12. 12.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) powder on a carrom board (d) a wheel on ball bearings
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 9 N, a carpet 10 N, ice 3 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a glass sheet (d) a wooden plank
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) powder on a carrom board (d) a grippy rubber sole
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
16. 16.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
17. 17.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
18. 18.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
19. 19.True or false: a tyre with deep treads gives less friction. (a) True (b) False
20. 20.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
21. 21.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
22. 22.🛞 Rubbing your hands fast makes them … (a) wet (b) warm (c) magnetic (d) cold
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) chalk on a gym bar (d) a wet tiled floor
24. 24.True or false: chalk on a gym bar gives less friction. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wheel on ball bearings (c) a tyre with deep treads (d) sand on a slippery path
26. 26.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) a rough doormat
27. 27.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wet tiled floor (c) a tyre with deep treads (d) sand on a slippery path
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 12 N, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. How many newtons more were needed on sandpaper than on ice?
30. 30.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
32. 32.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
33. 33.🛞 Friction acts … (a) only on ice (b) against the motion (c) with the motion (d) only upwards
34. 34.True or false: a tyre with deep treads gives more friction. (a) False (b) True
35. 35.🛞 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, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
36. 36.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) press parts harder (d) add sand
37. 37.True or false: a rough doormat gives more friction. (a) False (b) True
38. 38.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
39. 39.True or false: skating on ice gives more friction. (a) False (b) True
40. 40.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction

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