Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 921 · 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.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a wooden plank 10 N, a carpet 13 N, ice 3 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) a carpet
3. 3.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, ice 2 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
5. 5.🛞 Friction acts … (a) only upwards (b) against the motion (c) with the motion (d) only on ice
6. 6.True or false: a box pushed on carpet gives more friction. (a) True (b) False
7. 7.True or false: chalk on a gym bar gives more friction. (a) False (b) True
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, sandpaper 8 N, ice 3 N, a glass sheet 5 N. How many newtons more were needed on sandpaper than on ice?
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
11. 11.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
12. 12.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
15. 15.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) sandpaper (d) polished marble
16. 16.🛞 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 6 N, sandpaper 8 N. How many newtons more were needed on sandpaper than on ice?
17. 17.🔍 Which is the odd one out? (a) a tyre with deep treads (b) skating on ice (c) a wheel on ball bearings (d) powder on a carrom board
18. 18.🛞 Why are tyres made with deep treads? (a) to look nice (b) to grip the road (c) to save rubber (d) to go slower
19. 19.True or false: skating on ice gives less friction. (a) False (b) True
20. 20.True or false: a rough doormat gives more friction. (a) True (b) False
21. 21.True or false: powder on a carrom board gives more friction. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a wet tiled floor (b) a rough doormat (c) oil on a squeaky hinge (d) a wheel on ball bearings
23. 23.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) a grippy rubber sole (d) powder on a carrom board
24. 24.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a grippy rubber sole (c) a tyre with deep treads (d) a wheel on ball bearings
25. 25.True or false: sand on a slippery path gives less friction. (a) True (b) False
26. 26.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
27. 27.🛞 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 carpet 5 N, sandpaper 6 N. Which surface gave the least friction? (a) sandpaper (b) ice (c) a carpet (d) a glass sheet
28. 28.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) a tyre with deep treads (d) chalk on a gym bar
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) ice (d) a glass sheet
30. 30.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) make parts rough (d) add sand
31. 31.🔍 Which is the odd one out? (a) sand on a slippery path (b) a box pushed on carpet (c) oil on a squeaky hinge (d) a grippy rubber sole
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 6 N, sandpaper 9 N, ice 1 N. Which surface gave the most friction? (a) ice (b) a carpet (c) a glass sheet (d) sandpaper
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
34. 34.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
35. 35.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
36. 36.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
38. 38.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 12 N, sandpaper 15 N, ice 4 N, a wooden plank 8 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 3 N, a carpet 5 N, sandpaper 6 N. Which surface gave the most friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet

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