Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 798 · 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.⚙️ Which simple machine is a chisel? (a) lever (b) wedge (c) wheel and axle (d) inclined plane
2. 2.Which of these is caused by gravity? (a) squeezing a lemon (b) a thrown ball comes down (c) a magnet picks up pins (d) a compass needle turns
3. 3.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
4. 4.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
5. 5.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Meena (560 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
6. 6.🪝 A well winch has a handle (wheel) of radius 40 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
7. 7.🔍 Which is the odd one out? (a) powder on a carrom board (b) a box pushed on carpet (c) a smooth steel slide (d) oil on a squeaky hinge
8. 8.💪 Which force is at work: an apple falls down? (a) friction (b) magnetic force (c) gravity (d) muscular force
9. 9.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) closer to the pivot (c) on the pivot (d) anywhere
10. 10.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
11. 11.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, by half (c) no, work stays the same (d) yes, always
12. 12.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 8 m, how many metres of rope must you pull?
13. 13.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) True (b) False
14. 14.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
15. 15.🔍 Which is the odd one out? (a) sand on a slippery path (b) a wheel on ball bearings (c) a box pushed on carpet (d) chalk on a gym bar
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
17. 17.⚖️ A seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Kabir (450 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🏋️ A machine lifts a load of 320 N when you push with 80 N. What is its mechanical advantage (MA)?
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
21. 21.💪 Which force is at work: a thrown ball comes down? (a) friction (b) gravity (c) magnetic force (d) muscular force
22. 22.🪝 A pulley system lifts a 900 N load with an effort of 300 N. What is its mechanical advantage (MA)?
23. 23.Which of these is caused by gravity? (a) rain falls to the ground (b) lifting a school bag (c) brakes stop a bicycle (d) a rolling ball slows
24. 24.⚖️ A seesaw balances. Ravi (520 N) sits ? m from the pivot on one side; Kabir (260 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
25. 25.🏋️ Pushing a crate 7 m took 3080 J of work. What force was used, in newtons?
26. 26.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the effort (c) the load (d) the fulcrum
27. 27.True or false: a movable pulley is on a flagpole top. (a) False (b) True
28. 28.⚙️ Which simple machine is the tip of a nail? (a) lever (b) screw (c) wedge (d) pulley
29. 29.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 3 (b) class 1 (c) class 2
30. 30.🪝 A winch has a wheel of radius 6 cm and an axle of radius 1 cm. What effort on the wheel lifts a 1080 N bucket on the axle, in newtons? (ideal)
31. 31.⚙️ A wedge is … (a) a rope on a wheel (b) two ramps back to back (c) a wheel on a rod (d) a bar on a pivot
32. 32.💪 A bag has a mass of 59 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
33. 33.🏋️ A machine lifts a load of 160 N when you push with 40 N. What is its mechanical advantage (MA)?
34. 34.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 9 N, sandpaper 11 N. Which surface gave the least friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
35. 35.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 1 (c) class 3
36. 36.True or false: pushing a swing is a push. (a) False (b) True
37. 37.⚙️ Which simple machine is a seesaw? (a) lever (b) pulley (c) wedge (d) screw
38. 38.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
39. 39.⚖️ A lever bar balances. The load is 90 N at 30 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.⚖️ A lever bar balances. The load is ? N at 50 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?

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