Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 66 · 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.🛞 Friction acts … (a) with the motion (b) only on ice (c) only upwards (d) against the motion
2. 2.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
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: sand on a slippery path gives less friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) oil on a squeaky hinge (d) chalk on a gym bar
6. 6.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
7. 7.🛞 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 7 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on ice?
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a glass sheet 6 N, a carpet 8 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 11 N, ice 3 N, a glass sheet 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 2 N, a glass sheet 3 N, a wooden plank 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
11. 11.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 6 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on a carpet than on ice?
14. 14.True or false: a rough doormat gives more friction. (a) True (b) False
15. 15.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
16. 16.True or false: a smooth steel slide gives less friction. (a) True (b) False
17. 17.True or false: sand on a slippery path gives more friction. (a) False (b) True
18. 18.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 7 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 8 N, sandpaper 12 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) skating on ice (c) a tyre with deep treads (d) powder on a carrom board
23. 23.True or false: a wet tiled floor gives less friction. (a) True (b) False
24. 24.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 2 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
26. 26.🔍 Which is the odd one out? (a) a smooth steel slide (b) a box pushed on carpet (c) sand on a slippery path (d) a grippy rubber sole
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
28. 28.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) oil on a squeaky hinge (d) a box pushed on carpet
29. 29.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 3 N, a glass sheet 7 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 8 N, a carpet 12 N, sandpaper 13 N, ice 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
32. 32.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
33. 33.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to look nice (d) to go slower
34. 34.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
35. 35.🔍 Which is the odd one out? (a) sand on a slippery path (b) chalk on a gym bar (c) a wheel on ball bearings (d) a box pushed on carpet
36. 36.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
37. 37.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 11 N, ice 4 N, a glass sheet 6 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 10 N, a glass sheet 2 N, a wooden plank 5 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 5 N, sandpaper 6 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?

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