Engineering Worksheet: Friction

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

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