Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 63 · 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.True or false: a tug of war is a push. (a) True (b) False
2. 2.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.Which of these is caused by muscular force? (a) a rolling ball slows (b) a thrown ball comes down (c) an apple falls down (d) lifting a school bag
4. 4.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
5. 5.💪 A box weighs 590 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.⚖️ A seesaw balances. Arjun (640 N) sits ? m from the pivot on one side; Ravi (160 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🪝 A winch has a wheel of radius 28 cm and an axle of radius 4 cm. What effort on the wheel lifts a 1120 N bucket on the axle, in newtons? (ideal)
8. 8.⚖️ A seesaw balances. Arjun (540 N) sits 4 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.💪 A bag has a mass of 51 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
10. 10.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
11. 11.⚙️ A wedge is … (a) a bar on a pivot (b) a wheel on a rod (c) two ramps back to back (d) a rope on a wheel
12. 12.🛞 Rubbing your hands fast makes them … (a) magnetic (b) wet (c) warm (d) cold
13. 13.🛞 More or less friction: a smooth steel slide? (a) less friction (b) more friction
14. 14.🪝 A pulley system lifts a 1160 N load with an effort of 290 N. What is its mechanical advantage (MA)?
15. 15.True or false: a movable pulley only changes direction. (a) True (b) False
16. 16.True or false: a well winch handle is a wheel and axle. (a) False (b) True
17. 17.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 60 cm and the load at 20 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
18. 18.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
19. 19.🏋️ A force of 500 N pushes a cart 1 m along the floor. How much work is done, in joules?
20. 20.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
21. 21.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
22. 22.True or false: your forearm is a class 2 lever (load in the middle). (a) False (b) True
23. 23.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
24. 24.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
25. 25.⚙️ Which simple machine is a jar lid? (a) screw (b) lever (c) inclined plane (d) wheel and axle
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 50 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
27. 27.⚖️ A lever bar balances. The load is 120 N at 50 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
28. 28.⚖️ Turning effect = force × … (a) time taken (b) distance from fulcrum (c) mass of fulcrum (d) colour of bar
29. 29.🔍 Which is the odd one out? (a) a steering wheel (b) a door stopper (c) a knife edge (d) a chisel
30. 30.True or false: a window blind cord is a wheel and axle. (a) True (b) False
31. 31.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
32. 32.⚖️ A seesaw balances. Ravi (? N) sits 4 m from the pivot on one side; Zoya (720 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 40 cm and the load at 60 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
34. 34.True or false: a lemon squeezer is a class 2 lever (load in the middle). (a) True (b) False
35. 35.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts an 80 N bucket on the axle, in newtons? (ideal)
36. 36.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
37. 37.⚙️ Which simple machine is a water tap handle? (a) lever (b) screw (c) inclined plane (d) wheel and axle
38. 38.True or false: a fixed pulley needs effort = load. (a) False (b) True
39. 39.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) farther from the pivot (d) on the pivot
40. 40.🏋️ A machine lifts a load of 350 N when you push with 70 N. What is its mechanical advantage (MA)?

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