Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 499 · 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.True or false: the tip of a nail is a pulley. (a) True (b) False
2. 2.🪝 A bucket weighing 460 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
3. 3.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 160 N bucket on the axle, in newtons? (ideal)
4. 4.Which of these is a screw? (a) a bottle cap (b) a crowbar (c) a flagpole rope wheel (d) a claw hammer on a nail
5. 5.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 2 (c) class 3
6. 6.True or false: a crowbar is a class 2 lever (load in the middle). (a) True (b) False
7. 7.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
8. 8.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Meena (240 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚖️ A lever bar balances. The load is 100 N at ? cm from the fulcrum. The effort is 60 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.True or false: a movable pulley is on a flagpole top. (a) True (b) False
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
12. 12.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
13. 13.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) anywhere (d) closer to the pivot
14. 14.⚖️ A lever bar balances. The load is 80 N at 50 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, sandpaper 9 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) a glass sheet (d) ice
16. 16.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
17. 17.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
18. 18.🏋️ A force of 20 N did 60 J of work. How many metres did the object move?
19. 19.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
20. 20.🪝 What does a single fixed pulley change? (a) the size of the load (b) the direction of pull (c) gravity (d) the colour of rope
21. 21.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) a compass needle turns (c) a river flows downhill (d) rain falls to the ground
22. 22.Which of these is a lever? (a) a chisel (b) a nutcracker (c) a flagpole rope wheel (d) a round doorknob
23. 23.⚖️ Which class of lever is a pair of pliers? (a) class 3 (b) class 2 (c) class 1
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 70 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
25. 25.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
26. 26.💪 A cart is pulled to the right with 100 N and to the left with 95 N. Which way does the net force act? (a) to the left (b) to the right (c) no net force
27. 27.🏋️ A 2 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
28. 28.🏋️ A machine lifts a load of 180 N when you push with 30 N. What is its mechanical advantage (MA)?
29. 29.🪝 A load of 1080 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
30. 30.💪 A bag has a mass of 43 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
31. 31.⚙️ Most simple machines make work easier by letting us … (a) use a smaller force (b) stop all friction (c) make new energy (d) switch off gravity
32. 32.⚖️ In a class 2 lever, what is in the middle? (a) the load (b) the effort (c) the fulcrum (d) the axle
33. 33.True or false: a road up a hill is a pulley. (a) True (b) False
34. 34.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 450 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
35. 35.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
36. 36.⚖️ A seesaw balances. Zoya (480 N) sits ? m from the pivot on one side; Ravi (160 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?
37. 37.⚖️ 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 2 (c) class 3
38. 38.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
39. 39.🏋️ A machine lifts a load of 800 N when you push with 200 N. What is its mechanical advantage (MA)?
40. 40.⚖️ A seesaw balances. Ravi (170 N) sits ? m from the pivot on one side; Kabir (170 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?

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