Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 354 · 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.🏋️ A 16 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
3. 3.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
5. 5.⚖️ Going along a lever from one end to the other, the order is: load, fulcrum, effort. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
6. 6.🛞 Is friction helpful or a problem here: a knot holding a rope? (a) a problem (b) helpful
7. 7.True or false: plucking a mango is a push. (a) True (b) False
8. 8.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) very slowly (d) only upwards
9. 9.🔍 Which is the odd one out? (a) a box pushed on carpet (b) oil on a squeaky hinge (c) skating on ice (d) powder on a carrom board
10. 10.True or false: chalk on a gym bar gives less friction. (a) False (b) True
11. 11.🏋️ A 2 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
12. 12.⚖️ A seesaw balances. Meena (420 N) sits 1 m from the pivot on one side; Arjun (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
13. 13.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
14. 14.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
15. 15.⚖️ Which class of lever is a lemon squeezer? (a) class 3 (b) class 2 (c) class 1
16. 16.⚙️ Which simple machine is a wheelchair ramp? (a) pulley (b) wedge (c) inclined plane (d) wheel and axle
17. 17.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1
18. 18.🏋️ A force of 100 N did 100 J of work. How many metres did the object move?
19. 19.💪 A cart is pulled to the right with 75 N and to the left with 75 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
20. 20.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
21. 21.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
22. 22.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
23. 23.💪 A cart is pulled to the right with 20 N and to the left with 10 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
24. 24.🔍 Which is the odd one out? (a) a window blind cord (b) a crane hook block (c) a nutcracker (d) a flagpole rope wheel
25. 25.⚙️ Which simple machine is a flagpole rope wheel? (a) wheel and axle (b) lever (c) wedge (d) pulley
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
27. 27.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
28. 28.⚖️ Which class of lever is a beam balance? (a) class 3 (b) class 1 (c) class 2
29. 29.⚙️ Which simple machine is a nutcracker? (a) inclined plane (b) wedge (c) pulley (d) lever
30. 30.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
31. 31.🏋️ In which unit is work measured? (a) newton (N) (b) joule (J) (c) watt hour (d) metre (m)
32. 32.💪 Which force is at work: lifting a school bag? (a) friction (b) muscular force (c) magnetic force (d) gravity
33. 33.🪝 A pulley system lifts a 420 N load with an effort of 210 N. What is its mechanical advantage (MA)?
34. 34.⚙️ Which simple machine is a claw hammer on a nail? (a) lever (b) pulley (c) inclined plane (d) wedge
35. 35.💪 Two children push a box to the right, one with 60 N and the other with 95 N. What is the net (total) force on the box, in newtons?
36. 36.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
37. 37.💪 In a tug of war, one team pulls right with 30 N and the other pulls left with 5 N. What is the size of the net force, in newtons?
38. 38.🛞 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, ice 1 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
39. 39.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
40. 40.🏋️ An 11 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?

Free engineering lessons, practice and worksheets at talentjr.in/engineering-for-kids