Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 206 · 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 cart is pulled to the right with 50 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
2. 2.⚖️ A seesaw balances. Zoya (150 N) sits 4 m from the pivot on one side; Kabir (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 20 cm and the load at 0 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
4. 4.⚖️ A seesaw balances. Kabir (? N) sits 4 m from the pivot on one side; Zoya (560 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🛞 More or less friction: sand on a slippery path? (a) less friction (b) more friction
6. 6.True or false: a fishing rod is a class 2 lever (load in the middle). (a) True (b) False
7. 7.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) turning effects match (d) the fulcrum moves
8. 8.True or false: a claw hammer on a nail is a wheel and axle. (a) True (b) False
9. 9.True or false: sand on a slippery path gives more friction. (a) False (b) True
10. 10.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
11. 11.⚖️ A seesaw balances. Zoya (? N) sits 2 m from the pivot on one side; Arjun (240 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🪝 A bucket weighing 370 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
13. 13.True or false: a road up a hill is an inclined plane. (a) True (b) False
14. 14.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.True or false: a fixed pulley needs effort = load. (a) False (b) True
16. 16.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
17. 17.True or false: a fixed pulley only changes direction. (a) True (b) False
18. 18.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 80 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
19. 19.🏋️ Pushing a crate 10 m took 3900 J of work. What force was used, in newtons?
20. 20.True or false: pressing a doorbell is a pull. (a) False (b) True
21. 21.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
22. 22.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 1 (c) class 3
23. 23.⚖️ A lever bar balances. The load is ? N at 50 cm from the fulcrum. The effort is 500 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
24. 24.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) glass (c) polished marble (d) ice
25. 25.True or false: a pair of scissors is a class 2 lever (load in the middle). (a) False (b) True
26. 26.⚖️ A seesaw balances. Kabir (? N) sits 2 m from the pivot on one side; Zoya (200 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.🏋️ A force of 180 N did 1620 J of work. How many metres did the object move?
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
29. 29.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the pulley (c) the fulcrum (d) the effort
30. 30.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
31. 31.Which of these is a screw? (a) a steering wheel (b) a playground slide (c) a jar lid (d) a well-bucket rope wheel
32. 32.⚖️ A seesaw balances. Kabir (110 N) sits ? m from the pivot on one side; Ravi (110 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
33. 33.⚙️ Which simple machine is a round doorknob? (a) wheel and axle (b) inclined plane (c) screw (d) wedge
34. 34.⚖️ In a class 1 lever, what is in the middle? (a) the effort (b) nothing (c) the load (d) the fulcrum
35. 35.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Kabir (280 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
37. 37.⚖️ A lever bar balances. The load is 50 N at 40 cm from the fulcrum. The effort is 40 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.True or false: a wheelchair ramp is an inclined plane. (a) True (b) False
39. 39.⚖️ A seesaw balances. Asha (400 N) sits 1 m from the pivot on one side; Ravi (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
40. 40.True or false: a broom when sweeping is a class 2 lever (load in the middle). (a) True (b) False

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