Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 970 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 3 N, a glass sheet 4 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on ice?
2. 2.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 6 N, a wooden plank 7 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a wooden plank 6 N, a carpet 8 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
4. 4.🛞 More or less friction: a tyre with deep treads? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 11 N, a carpet 13 N, ice 4 N, a glass sheet 7 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) ice (d) a glass sheet
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (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 8 N, sandpaper 11 N, ice 1 N. Which surface gave the most friction? (a) sandpaper (b) ice (c) a wooden plank (d) a carpet
8. 8.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) oil the moving parts (d) make parts rough
11. 11.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) oil on a squeaky hinge (d) skating on ice
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 3 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 10 N, sandpaper 13 N. How many newtons more were needed on sandpaper than on ice?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 9 N, ice 4 N, a wooden plank 6 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
16. 16.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
17. 17.🛞 Friction acts … (a) against the motion (b) with the motion (c) only on ice (d) only upwards
18. 18.True or false: a tyre with deep treads gives more friction. (a) True (b) False
19. 19.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
20. 20.True or false: a tyre with deep treads gives less 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 6 N, a carpet 9 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
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 9 N, a carpet 12 N, ice 3 N. Which surface gave the least friction? (a) ice (b) a glass sheet (c) a wooden plank (d) a carpet
23. 23.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
24. 24.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
25. 25.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a rough doormat (c) chalk on a gym bar (d) a wheel on ball bearings
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) a wooden plank
27. 27.True or false: sand on a slippery path gives less friction. (a) True (b) False
28. 28.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
29. 29.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 8 N, a carpet 9 N, ice 1 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) a carpet (d) ice
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 1 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on ice?
32. 32.🛞 More or less friction: skating on ice? (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 6 N, a carpet 10 N, sandpaper 11 N, a glass sheet 4 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a carpet (d) a glass sheet
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a rough doormat (d) a box pushed on carpet
36. 36.🔍 Which is the odd one out? (a) skating on ice (b) a wheel on ball bearings (c) sand on a slippery path (d) powder on a carrom board
37. 37.True or false: skating on ice gives less friction. (a) False (b) True
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 4 N, a wooden plank 6 N, a carpet 8 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 8 N, a carpet 11 N. How many newtons more were needed on sandpaper than on ice?
40. 40.🔍 Which is the odd one out? (a) a box pushed on carpet (b) powder on a carrom board (c) sand on a slippery path (d) a tyre with deep treads

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