Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 501 · 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 smooth steel slide? (a) less friction (b) more friction
2. 2.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
3. 3.True or false: chalk on a gym bar gives less friction. (a) True (b) False
4. 4.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, sandpaper 13 N, ice 3 N, a glass sheet 5 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
6. 6.True or false: a box pushed on carpet gives less friction. (a) True (b) False
7. 7.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
8. 8.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
9. 9.True or false: a tyre with deep treads gives less friction. (a) True (b) False
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
11. 11.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
13. 13.True or false: skating on ice gives less friction. (a) False (b) True
14. 14.True or false: a grippy rubber sole gives more friction. (a) False (b) True
15. 15.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
17. 17.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
18. 18.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
19. 19.🔍 Which is the odd one out? (a) a tyre with deep treads (b) chalk on a gym bar (c) a wet tiled floor (d) a grippy rubber sole
20. 20.🔍 Which is the odd one out? (a) a wet tiled floor (b) a box pushed on carpet (c) powder on a carrom board (d) oil on a squeaky hinge
21. 21.🛞 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 5 N, a carpet 9 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a carpet (d) sandpaper
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
23. 23.🔍 Which is the odd one out? (a) a rough doormat (b) chalk on a gym bar (c) a grippy rubber sole (d) a smooth steel slide
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 4 N, a carpet 5 N, sandpaper 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) sandpaper
25. 25.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wet tiled floor (c) a rough doormat (d) skating on ice
26. 26.True or false: sand on a slippery path gives more friction. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a smooth steel slide (c) powder on a carrom board (d) chalk on a gym bar
28. 28.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
29. 29.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
30. 30.🔍 Which is the odd one out? (a) skating on ice (b) a rough doormat (c) chalk on a gym bar (d) a grippy rubber sole
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 10 N, a carpet 13 N, ice 3 N, a glass sheet 7 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) ice
32. 32.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
33. 33.True or false: sand on a slippery path gives less friction. (a) True (b) False
34. 34.True or false: a wet tiled floor gives more friction. (a) False (b) True
35. 35.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
36. 36.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
37. 37.True or false: a grippy rubber sole gives less friction. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) powder on a carrom board (c) a smooth steel slide (d) a tyre with deep treads
39. 39.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
40. 40.🛞 More or less friction: powder on a carrom board? (a) less friction (b) more friction

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