Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 75 · 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 16 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
2. 2.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 2 (c) class 3
3. 3.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) closer to the pivot (c) anywhere (d) farther from the pivot
4. 4.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
5. 5.💪 Which force is at work: rain falls to the ground? (a) gravity (b) friction (c) muscular force (d) magnetic force
6. 6.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 40 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.💪 Is closing a drawer a push or a pull? (a) a pull (b) a push
8. 8.Which of these is a lever? (a) a well winch handle (b) a well-bucket rope wheel (c) a playground slide (d) a bottle opener
9. 9.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
10. 10.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1100 N box up it, in newtons? (ideal ramp, no friction)
11. 11.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 1 (c) class 3
12. 12.💪 Is pushing a trolley a push or a pull? (a) a push (b) a pull
13. 13.Which of these is a pulley? (a) a flagpole rope wheel (b) a claw hammer on a nail (c) a water tap handle (d) an axe blade
14. 14.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
15. 15.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley
16. 16.⚖️ A lever bar balances. The load is 300 N at 20 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
17. 17.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
18. 18.⚖️ A seesaw balances. Arjun (? N) sits 1 m from the pivot on one side; Asha (150 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🏋️ A force of 280 N pushes a cart 7 m along the floor. How much work is done, in joules?
20. 20.⚖️ Which class of lever is a bottle opener? (a) class 1 (b) class 3 (c) class 2
21. 21.🔍 Which is the odd one out? (a) a rough doormat (b) a wet tiled floor (c) a wheel on ball bearings (d) a smooth steel slide
22. 22.⚖️ Which class of lever is a seesaw? (a) class 2 (b) class 3 (c) class 1
23. 23.⚖️ Along a straight bar, measured from the left end, the effort is at 80 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
24. 24.Which of these is caused by muscular force? (a) rain falls to the ground (b) a river flows downhill (c) pedalling a cycle (d) brakes stop a bicycle
25. 25.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Asha (190 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 100 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.⚖️ A lever balances when … (a) both weights are equal (b) the fulcrum moves (c) turning effects match (d) the bar is short
28. 28.⚖️ A seesaw balances. Asha (200 N) sits ? m from the pivot on one side; Zoya (600 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
29. 29.True or false: a steering wheel is a lever. (a) False (b) True
30. 30.True or false: a grippy rubber sole gives more friction. (a) False (b) True
31. 31.True or false: powder on a carrom board gives less friction. (a) True (b) False
32. 32.True or false: a crowbar is a lever. (a) True (b) False
33. 33.True or false: a rough doormat gives more friction. (a) False (b) True
34. 34.True or false: a tug of war is a push. (a) True (b) False
35. 35.⚖️ A seesaw balances. Arjun (760 N) sits ? m from the pivot on one side; Zoya (380 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
36. 36.🏋️ Pushing a crate 7 m took 3080 J of work. What force was used, in newtons?
37. 37.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
38. 38.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the load (d) the effort
39. 39.💪 Which force is at work: rubbing hands warms them? (a) muscular force (b) gravity (c) magnetic force (d) friction
40. 40.⚖️ Turning effect = force × … (a) time taken (b) mass of fulcrum (c) colour of bar (d) distance from fulcrum

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