Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 744 · 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: oil on a squeaky hinge? (a) more friction (b) less friction
2. 2.True or false: skating on ice gives more friction. (a) True (b) False
3. 3.🛞 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 8 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
4. 4.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
6. 6.True or false: a box pushed on carpet gives more friction. (a) True (b) False
7. 7.True or false: sand on a slippery path gives less friction. (a) True (b) False
8. 8.True or false: a grippy rubber sole gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) powder on a carrom board (d) a tyre with deep treads
11. 11.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
12. 12.True or false: a smooth steel slide gives less friction. (a) False (b) True
13. 13.🛞 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 9 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
14. 14.🛞 Friction acts … (a) against the motion (b) with the motion (c) only upwards (d) only on ice
15. 15.True or false: a rough doormat gives more friction. (a) True (b) False
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 6 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a wooden plank
17. 17.🛞 Why are tyres made with deep treads? (a) to go slower (b) to look nice (c) to save rubber (d) to grip the road
18. 18.True or false: powder on a carrom board gives less friction. (a) False (b) True
19. 19.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 6 N, sandpaper 8 N, ice 2 N. Which surface gave the most friction? (a) a carpet (b) sandpaper (c) ice (d) a glass sheet
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 4 N, a wooden plank 7 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a wooden plank
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 6 N, sandpaper 7 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
23. 23.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) ice (c) sandpaper (d) polished marble
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
26. 26.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a smooth steel slide (d) a box pushed on carpet
27. 27.🔍 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
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
29. 29.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
30. 30.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
31. 31.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
32. 32.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
33. 33.True or false: a wet tiled floor gives more friction. (a) True (b) False
34. 34.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) wet (d) warm
35. 35.True or false: a tyre with deep treads gives less friction. (a) True (b) False
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 4 N, a carpet 5 N, sandpaper 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 8 N, sandpaper 12 N, ice 1 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
38. 38.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
39. 39.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
40. 40.🛞 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 5 N, a carpet 8 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet

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