Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 771 · 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.Which of these is a lever? (a) a well-bucket rope wheel (b) a nutcracker (c) a crane hook block (d) an axe blade
2. 2.⚙️ Which simple machine is a water tap handle? (a) wedge (b) lever (c) wheel and axle (d) inclined plane
3. 3.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
4. 4.💪 Which force pulls everything towards the Earth? (a) friction (b) wind (c) gravity (d) magnetism
5. 5.⚖️ A seesaw balances. Meena (600 N) sits 1 m from the pivot on one side; Kabir (200 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
6. 6.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 0 cm and the load at 80 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
7. 7.⚙️ Which simple machine is the tip of a nail? (a) inclined plane (b) lever (c) wedge (d) wheel and axle
8. 8.🪝 A pulley system lifts an 840 N load with an effort of 280 N. What is its mechanical advantage (MA)?
9. 9.🏋️ A 7 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
10. 10.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
11. 11.💪 Is pushing a swing a push or a pull? (a) a pull (b) a push
12. 12.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) False (b) True
13. 13.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
14. 14.True or false: a wet tiled floor gives more friction. (a) False (b) True
15. 15.⚖️ A lever bar balances. The load is 630 N at 10 cm from the fulcrum. The effort is ? N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.🛞 How can we reduce friction in a machine? (a) make parts rough (b) oil the moving parts (c) add sand (d) press parts harder
17. 17.💪 Which force is at work: squeezing a lemon? (a) muscular force (b) friction (c) magnetic force (d) gravity
18. 18.⚖️ A lever bar balances. The load is 120 N at ? cm from the fulcrum. The effort is 80 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.🏋️ A machine lifts a load of 450 N when you push with 90 N. What is its mechanical advantage (MA)?
20. 20.True or false: a water tap handle is a pulley. (a) False (b) True
21. 21.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
22. 22.True or false: pushing a swing is a pull. (a) True (b) False
23. 23.True or false: sand on a slippery path gives more friction. (a) False (b) True
24. 24.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Asha (360 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
26. 26.⚖️ 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
27. 27.🏋️ A force of 400 N pushes a cart 9 m along the floor. How much work is done, in joules?
28. 28.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
29. 29.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) True (b) False
30. 30.💪 A bag has a mass of 12 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
31. 31.⚖️ A seesaw balances. Arjun (340 N) sits 2 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
33. 33.🔍 Which is the odd one out? (a) a grippy rubber sole (b) powder on a carrom board (c) a box pushed on carpet (d) a rough doormat
34. 34.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
35. 35.🛞 Is friction helpful or a problem here: walking without slipping? (a) helpful (b) a problem
36. 36.True or false: skating on ice gives less friction. (a) False (b) True
37. 37.True or false: drawing up a well bucket is a push. (a) True (b) False
38. 38.🪝 A load of 780 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
39. 39.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
40. 40.💪 Two children push a box to the right, one with 30 N and the other with 25 N. What is the net (total) force on the box, in newtons?

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