Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 516 · 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 box pushed on carpet? (a) less friction (b) more friction
2. 2.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) make parts rough (c) add sand (d) press parts harder
3. 3.True or false: a box pushed on carpet gives more friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a tyre with deep treads (c) a wheel on ball bearings (d) a smooth steel slide
5. 5.True or false: a grippy rubber sole gives less friction. (a) True (b) False
6. 6.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
7. 7.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
8. 8.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
9. 9.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a wet tiled floor (d) a grippy rubber sole
10. 10.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
11. 11.🛞 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, a carpet 7 N. Which surface gave the most friction? (a) a carpet (b) ice (c) a wooden plank (d) a glass sheet
12. 12.True or false: powder on a carrom board gives more friction. (a) True (b) False
13. 13.True or false: a rough doormat gives more friction. (a) True (b) False
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 2 N, a wooden plank 5 N, a carpet 7 N, sandpaper 8 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) a glass sheet (d) sandpaper
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 smooth steel slide? (a) more friction (b) less friction
18. 18.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) sand on a slippery path (c) a wet tiled floor (d) a wheel on ball bearings
19. 19.True or false: a smooth steel slide gives more friction. (a) True (b) False
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 3 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
21. 21.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
22. 22.🛞 Why are tyres made with deep treads? (a) to look nice (b) to go slower (c) to save rubber (d) to grip the road
23. 23.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
24. 24.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) warm (d) magnetic
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N, a carpet 3 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) sandpaper (d) a wooden plank
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 2 N, a carpet 4 N, sandpaper 7 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
27. 27.True or false: skating on ice gives more friction. (a) True (b) False
28. 28.True or false: a wet tiled floor gives less friction. (a) False (b) True
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) a carpet (d) a glass sheet
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 7 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) sandpaper (d) a carpet
31. 31.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
32. 32.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) chalk on a gym bar (d) a wet tiled floor
33. 33.🛞 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 4 N, sandpaper 5 N. How many newtons more were needed on sandpaper than on a glass sheet?
34. 34.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 14 N, ice 4 N, a wooden plank 8 N. Which surface gave the most friction? (a) a carpet (b) ice (c) sandpaper (d) a wooden plank
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 9 N, a glass sheet 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🔍 Which is the odd one out? (a) sand on a slippery path (b) powder on a carrom board (c) a box pushed on carpet (d) chalk on a gym bar
38. 38.True or false: a wheel on ball bearings gives more friction. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) powder on a carrom board
40. 40.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem

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