Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 985 · 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.🛞 Rubbing your hands fast makes them … (a) wet (b) magnetic (c) cold (d) warm
2. 2.🛞 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 carpet 7 N, sandpaper 11 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) ice
3. 3.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a wet tiled floor (c) a box pushed on carpet (d) a grippy rubber sole
4. 4.True or false: a wet tiled floor gives less friction. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a rough doormat (c) a tyre with deep treads (d) powder on a carrom board
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 13 N, ice 2 N, a glass sheet 6 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) sandpaper
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N, sandpaper 10 N. How many newtons more were needed on sandpaper than on a glass sheet?
8. 8.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
10. 10.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
11. 11.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
12. 12.🛞 Friction acts … (a) only on ice (b) with the motion (c) only upwards (d) against the motion
13. 13.True or false: a grippy rubber sole gives less friction. (a) True (b) False
14. 14.True or false: a smooth steel slide gives more friction. (a) False (b) True
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, a glass sheet 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
16. 16.🛞 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 13 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 3 N, a wooden plank 7 N, a carpet 9 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
18. 18.🔍 Which is the odd one out? (a) a wet tiled floor (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
19. 19.True or false: sand on a slippery path gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 4 N, sandpaper 5 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
21. 21.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, ice 1 N, a glass sheet 5 N, a wooden plank 9 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a wooden plank (d) a glass sheet
23. 23.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
24. 24.True or false: powder on a carrom board gives less friction. (a) False (b) True
25. 25.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
27. 27.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
28. 28.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
29. 29.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a rough doormat (c) chalk on a gym bar (d) a wheel on ball bearings
30. 30.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) sand on a slippery path (d) a grippy rubber sole
31. 31.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
32. 32.🔍 Which is the odd one out? (a) a rough doormat (b) a smooth steel slide (c) skating on ice (d) oil on a squeaky hinge
33. 33.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
34. 34.🛞 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 8 N, sandpaper 11 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
35. 35.🛞 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 11 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) a wooden plank
36. 36.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
37. 37.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 7 N, a carpet 11 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
40. 40.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful

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