Engineering Worksheet: Friction

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

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