Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 461 · 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 lever bar balances. The load is 40 N at ? cm from the fulcrum. The effort is 80 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
3. 3.⚖️ A seesaw balances. Ravi (200 N) sits 1 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.⚖️ Which class of lever is a crowbar? (a) class 2 (b) class 3 (c) class 1
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 4 N, sandpaper 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) ice (d) a carpet
6. 6.🏋️ Work is done when a force moves something … (a) without moving it (b) through a distance (c) only upwards (d) very slowly
7. 7.True or false: opening a drawer is a push. (a) False (b) True
8. 8.💪 Which can a force NOT do? (a) start it moving (b) stop it moving (c) change its colour (d) change its shape
9. 9.⚖️ A seesaw balances. Meena (100 N) sits ? m from the pivot on one side; Asha (300 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
10. 10.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
11. 11.🛞 Friction acts … (a) only upwards (b) only on ice (c) with the motion (d) against the motion
12. 12.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 50 cm and the load at 0 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
13. 13.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the fulcrum (b) far from the fulcrum (c) near the fulcrum (d) on the rock
14. 14.True or false: a tug of war is a pull. (a) False (b) True
15. 15.True or false: a lemon squeezer is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.💪 A force is a … (a) kind of colour (b) type of sound (c) push or a pull (d) unit of time
17. 17.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 10 m, how many metres of rope must you pull?
18. 18.🪝 A winch has a wheel of radius 14 cm and an axle of radius 2 cm. What effort on the wheel lifts a 770 N bucket on the axle, in newtons? (ideal)
19. 19.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Ravi (340 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) turning effects match (d) the fulcrum moves
21. 21.🏋️ Pushing a crate 6 m took 420 J of work. What force was used, in newtons?
22. 22.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 750 N box up it, in newtons? (ideal ramp, no friction)
23. 23.Which of these is a screw? (a) a window blind cord (b) a water tap handle (c) a nutcracker (d) a nut and bolt
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
25. 25.⚙️ Which simple machine is a knife edge? (a) inclined plane (b) wedge (c) pulley (d) screw
26. 26.🏋️ In which unit is work measured? (a) joule (J) (b) watt hour (c) metre (m) (d) newton (N)
27. 27.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
28. 28.🏋️ A 12 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
29. 29.🏋️ A machine lifts a load of 900 N when you push with 180 N. What is its mechanical advantage (MA)?
30. 30.🪝 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?
31. 31.🪝 A pulley system lifts a 480 N load with an effort of 120 N. What is its mechanical advantage (MA)?
32. 32.⚖️ A seesaw balances. Zoya (150 N) sits 4 m from the pivot on one side; Arjun (600 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
33. 33.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
34. 34.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
35. 35.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
36. 36.🪝 A bucket weighing 440 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.💪 Which force pulls everything towards the Earth? (a) magnetism (b) friction (c) wind (d) gravity
38. 38.True or false: your forearm is a class 2 lever (load in the middle). (a) True (b) False
39. 39.⚖️ A seesaw balances. Ravi (? N) sits 3 m from the pivot on one side; Kabir (570 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (130 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?

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