Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 511 · 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.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
2. 2.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
3. 3.Which of these is caused by gravity? (a) a compass needle turns (b) brakes stop a bicycle (c) a river flows downhill (d) rubbing hands warms them
4. 4.Which of these is an inclined plane? (a) the tip of a nail (b) a bottle opener (c) a chisel (d) a playground slide
5. 5.True or false: a tug of war is a push. (a) False (b) True
6. 6.True or false: a door stopper is an inclined plane. (a) False (b) True
7. 7.⚖️ A lever balances when … (a) turning effects match (b) both weights are equal (c) the fulcrum moves (d) the bar is short
8. 8.⚖️ A lever bar balances. The load is 320 N at 40 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
10. 10.True or false: a tug of war is a pull. (a) True (b) False
11. 11.🏋️ A 14 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.⚖️ In a class 2 lever, what is in the middle? (a) the effort (b) the fulcrum (c) the axle (d) the load
13. 13.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
14. 14.True or false: a nutcracker is a class 1 lever (fulcrum in the middle). (a) True (b) False
15. 15.True or false: a movable pulley halves the effort. (a) True (b) False
16. 16.🛞 More or less friction: oil on a squeaky hinge? (a) less friction (b) more friction
17. 17.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the effort (d) the load
18. 18.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the load (c) the effort (d) the fulcrum
19. 19.True or false: a movable pulley stays in one place. (a) True (b) False
20. 20.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
21. 21.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
22. 22.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
23. 23.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
24. 24.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 30 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
25. 25.🛞 Which surface gives the MOST friction to a sliding block? (a) polished marble (b) glass (c) sandpaper (d) ice
26. 26.🏋️ Pushing a crate 6 m took 2400 J of work. What force was used, in newtons?
27. 27.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Arjun (560 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
28. 28.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) distance from fulcrum (d) colour of bar
29. 29.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
30. 30.⚙️ Which simple machine is a claw hammer on a nail? (a) pulley (b) wedge (c) lever (d) inclined plane
31. 31.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 300 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
32. 32.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 90 cm and the load at 50 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
33. 33.True or false: skating on ice gives less friction. (a) True (b) False
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 100 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Arjun (600 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🏋️ In which unit is work measured? (a) metre (m) (b) newton (N) (c) joule (J) (d) watt hour
37. 37.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1400 N bucket on the axle, in newtons? (ideal)
38. 38.🪝 A well winch has a handle (wheel) of radius 2 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
39. 39.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
40. 40.⚖️ A seesaw balances. Ravi (510 N) sits ? m from the pivot on one side; Asha (170 N) sits 3 m from the pivot on the other side. What is the missing distance in metres?

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