Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 864 · 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 20 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚖️ A lever bar balances. The load is 20 N at 40 cm from the fulcrum. The effort is ? N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
3. 3.🪝 A winch has a wheel of radius 16 cm and an axle of radius 2 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
4. 4.⚖️ Which class of lever is a nutcracker? (a) class 3 (b) class 2 (c) class 1
5. 5.💪 Two equal forces push on a box from opposite sides. They are … (a) gravity (b) doubled (c) balanced (d) unbalanced
6. 6.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
7. 7.⚖️ A seesaw balances. Zoya (360 N) sits ? m from the pivot on one side; Meena (540 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
8. 8.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 0 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
9. 9.🪝 A well winch has a handle (wheel) of radius 25 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
10. 10.True or false: a beam balance is a class 2 lever (load in the middle). (a) True (b) False
11. 11.⚖️ 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 2 (c) class 1
12. 12.Which of these is caused by magnetic force? (a) a magnet picks up pins (b) lifting a school bag (c) a thrown ball comes down (d) rain falls to the ground
13. 13.🪝 Fixed or movable pulley: which one only changes direction? (a) a fixed pulley (b) a movable pulley
14. 14.⚖️ A lever bar balances. The load is 200 N at 40 cm from the fulcrum. The effort is 80 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🏋️ A force of 460 N pushes a cart 6 m along the floor. How much work is done, in joules?
16. 16.True or false: a wheelbarrow is a class 2 lever (load in the middle). (a) False (b) True
17. 17.True or false: a playground slide is a wedge. (a) True (b) False
18. 18.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
19. 19.🏋️ In which unit is work measured? (a) watt hour (b) metre (m) (c) newton (N) (d) joule (J)
20. 20.🔍 Which is the odd one out? (a) a chisel (b) a door stopper (c) a flagpole rope wheel (d) the tip of a nail
21. 21.True or false: powder on a carrom board gives more friction. (a) True (b) False
22. 22.⚙️ Which simple machine is a knife edge? (a) wheel and axle (b) wedge (c) screw (d) inclined plane
23. 23.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Arjun (300 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
25. 25.⚖️ 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
26. 26.True or false: a well-bucket rope wheel is a wheel and axle. (a) True (b) False
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) on the pivot (c) anywhere (d) closer to the pivot
28. 28.⚙️ Which simple machine is a wood screw? (a) screw (b) pulley (c) inclined plane (d) lever
29. 29.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 20 cm and the load at 50 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N. Which surface gave the least friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) sandpaper
31. 31.🔍 Which is the odd one out? (a) a knife edge (b) a water tap handle (c) an axe blade (d) the tip of a nail
32. 32.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
33. 33.⚖️ A lever bar balances. The load is 420 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.True or false: a well-bucket rope wheel is a pulley. (a) False (b) True
35. 35.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
36. 36.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
37. 37.🪝 A well winch has a handle (wheel) of radius 35 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 2 N, a wooden plank 4 N. How many newtons more were needed on sandpaper than on a glass sheet?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 2 N, a wooden plank 3 N, a carpet 4 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) a carpet
40. 40.🪝 A load of 330 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)

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