Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 286 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.🛞 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, ice 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
2. 2.💪 A bag has a mass of 29 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
3. 3.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.🔍 Which is the odd one out? (a) a door stopper (b) a chisel (c) an axe blade (d) a wood screw
5. 5.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
6. 6.🏋️ A longer ramp to the same height needs … (a) the same effort (b) more effort (c) less effort (d) no effort
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
8. 8.💪 Which force is at work: brakes stop a bicycle? (a) friction (b) gravity (c) muscular force (d) magnetic force
9. 9.🪝 A load of 60 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
10. 10.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) skating on ice (d) a smooth steel slide
11. 11.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
12. 12.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 8 N, sandpaper 9 N, a glass sheet 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) a carpet
14. 14.⚙️ Which simple machine is a door stopper? (a) lever (b) pulley (c) wedge (d) inclined plane
15. 15.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
17. 17.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
18. 18.🛞 Rubbing your hands fast makes them … (a) cold (b) wet (c) magnetic (d) warm
19. 19.🏋️ A machine lifts a load of 300 N when you push with 100 N. What is its mechanical advantage (MA)?
20. 20.⚖️ A lever bar balances. The load is 400 N at 20 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
22. 22.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
23. 23.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
24. 24.⚙️ A wedge is … (a) a rope on a wheel (b) a wheel on a rod (c) a bar on a pivot (d) two ramps back to back
25. 25.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
26. 26.🛞 Which surface gives the MOST friction to a sliding block? (a) glass (b) polished marble (c) sandpaper (d) ice
27. 27.🏋️ Pushing a crate 9 m took 180 J of work. What force was used, in newtons?
28. 28.True or false: skating on ice gives more friction. (a) False (b) True
29. 29.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) farther from the pivot (d) closer to the pivot
30. 30.True or false: pressing a doorbell is a pull. (a) True (b) False
31. 31.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 8 N, ice 4 N, a glass sheet 5 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) ice (d) a glass sheet
32. 32.⚙️ Which simple machine is a bottle opener? (a) pulley (b) lever (c) inclined plane (d) wheel and axle
33. 33.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
34. 34.💪 Which force is at work: a river flows downhill? (a) friction (b) muscular force (c) gravity (d) magnetic force
35. 35.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
36. 36.🪝 A bucket weighing 270 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
37. 37.True or false: chalk on a gym bar gives more friction. (a) True (b) False
38. 38.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 60 N. What is the size of the net force, in newtons?
39. 39.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
40. 40.🛞 How can we reduce friction in a machine? (a) press parts harder (b) make parts rough (c) add sand (d) oil the moving parts

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