Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 503 · 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.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to save rubber (c) to go slower (d) to look nice
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 8 N, sandpaper 11 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
3. 3.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) a problem (b) helpful
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 8 N, sandpaper 10 N, ice 1 N, a glass sheet 5 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
5. 5.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
6. 6.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 8 N, a glass sheet 1 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 7 N, ice 1 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on ice?
10. 10.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 7 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
12. 12.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a rough doormat (d) a tyre with deep treads
13. 13.🔍 Which is the odd one out? (a) sand on a slippery path (b) a grippy rubber sole (c) a rough doormat (d) powder on a carrom board
14. 14.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) a grippy rubber sole (d) skating on ice
15. 15.True or false: powder on a carrom board gives less friction. (a) True (b) False
16. 16.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
17. 17.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 2 N, a glass sheet 5 N, a carpet 7 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 3 N, a glass sheet 4 N, a carpet 5 N. How many newtons more were needed on sandpaper than on ice?
20. 20.True or false: powder on a carrom board gives more friction. (a) True (b) False
21. 21.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 8 N, ice 4 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
23. 23.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) glass (d) ice
25. 25.🔍 Which is the odd one out? (a) a wet tiled floor (b) oil on a squeaky hinge (c) skating on ice (d) a box pushed on carpet
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 1 N, a glass sheet 2 N, a carpet 3 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a glass sheet (d) a carpet
27. 27.True or false: a rough doormat gives less friction. (a) True (b) False
28. 28.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
29. 29.True or false: a tyre with deep treads gives more friction. (a) True (b) False
30. 30.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, a glass sheet 4 N. Which surface gave the most friction? (a) sandpaper (b) a carpet (c) a wooden plank (d) a glass sheet
32. 32.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, ice 2 N, a glass sheet 3 N. How many newtons more were needed on a carpet than on ice?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 3 N, a carpet 7 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the most friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
35. 35.🛞 Rubbing your hands fast makes them … (a) warm (b) cold (c) wet (d) magnetic
36. 36.🛞 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 wooden plank 9 N. Which surface gave the most friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
37. 37.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
38. 38.True or false: a tyre with deep treads gives less friction. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) sand on a slippery path (b) skating on ice (c) a wheel on ball bearings (d) a wet tiled floor
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet

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