Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 987 · 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: chalk on a gym bar? (a) more friction (b) less friction
2. 2.🛞 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 wooden plank 7 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
3. 3.🛞 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 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
4. 4.True or false: a box pushed on carpet gives less friction. (a) True (b) False
5. 5.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
6. 6.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
7. 7.🛞 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 6 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
8. 8.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a tyre with deep treads (c) a rough doormat (d) oil on a squeaky hinge
9. 9.True or false: a rough doormat gives less friction. (a) True (b) False
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a carpet 9 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) sandpaper (c) a wooden plank (d) a carpet
13. 13.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 3 N, a carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
16. 16.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
17. 17.🛞 Rubbing your hands fast makes them … (a) cold (b) warm (c) wet (d) magnetic
18. 18.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
19. 19.True or false: a tyre with deep treads gives more friction. (a) False (b) True
20. 20.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
21. 21.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
22. 22.🛞 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 wooden plank 6 N, a carpet 10 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 7 N, a carpet 10 N, sandpaper 12 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) ice (d) sandpaper
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, a carpet 10 N, sandpaper 11 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
25. 25.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) a tyre with deep treads (d) skating on ice
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 6 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
27. 27.True or false: chalk on a gym bar gives less friction. (a) True (b) False
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N, ice 1 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
29. 29.🛞 Friction acts … (a) against the motion (b) only upwards (c) only on ice (d) with the motion
30. 30.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) oil the moving parts (d) add sand
31. 31.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 9 N, sandpaper 13 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
33. 33.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) powder on a carrom board (d) a box pushed on carpet
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 4 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a carpet
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 8 N, sandpaper 11 N, ice 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 7 N, a carpet 9 N, ice 2 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) a carpet
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 8 N, ice 3 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
38. 38.True or false: a grippy rubber sole gives more friction. (a) False (b) True
39. 39.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
40. 40.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction

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