Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 791 · 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 class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
2. 2.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 2 (c) class 1
3. 3.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) True (b) False
4. 4.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
5. 5.💪 A bag has a mass of 5 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
6. 6.True or false: a screw jack is a screw. (a) False (b) True
7. 7.🪝 A winch has a wheel of radius 3 cm and an axle of radius 1 cm. What effort on the wheel lifts a 540 N bucket on the axle, in newtons? (ideal)
8. 8.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 100 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
9. 9.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a smaller rod (axle) (c) a sharp wedge (d) a loose rope
10. 10.🏋️ Work is done when a force moves something … (a) through a distance (b) very slowly (c) without moving it (d) only upwards
11. 11.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 400 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
12. 12.🪝 A load of 160 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
13. 13.⚙️ Which simple machine is a water tap handle? (a) wheel and axle (b) wedge (c) inclined plane (d) screw
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
16. 16.💪 A force is a … (a) unit of time (b) type of sound (c) push or a pull (d) kind of colour
17. 17.⚖️ A seesaw balances. Arjun (200 N) sits 3 m from the pivot on one side; Kabir (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
18. 18.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Kabir (100 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
20. 20.⚙️ Which simple machine is a bottle cap? (a) lever (b) wheel and axle (c) screw (d) inclined plane
21. 21.💪 Is closing a drawer a push or a pull? (a) a push (b) a pull
22. 22.🏋️ A force of 490 N pushes a cart 1 m along the floor. How much work is done, in joules?
23. 23.Which of these is caused by friction? (a) squeezing a lemon (b) lifting a school bag (c) an apple falls down (d) a rolling ball slows
24. 24.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load ÷ effort (c) load + effort (d) load × effort
25. 25.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
26. 26.⚖️ A seesaw balances. Arjun (220 N) sits 1 m from the pivot on one side; Asha (110 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
27. 27.⚙️ Which simple machine is a crane hook block? (a) pulley (b) wheel and axle (c) wedge (d) inclined plane
28. 28.Which of these is caused by magnetic force? (a) lifting a school bag (b) a fridge magnet sticks (c) a thrown ball comes down (d) pedalling a cycle
29. 29.⚖️ A seesaw balances. Zoya (110 N) sits 1 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) helpful (b) a problem
31. 31.💪 Which force pulls everything towards the Earth? (a) friction (b) gravity (c) magnetism (d) wind
32. 32.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
33. 33.Which of these is a wedge? (a) a knife edge (b) a nutcracker (c) a wood screw (d) a flagpole rope wheel
34. 34.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) nothing (c) the effort (d) the load
35. 35.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) True (b) False
36. 36.⚙️ A wedge is … (a) two ramps back to back (b) a rope on a wheel (c) a bar on a pivot (d) a wheel on a rod
37. 37.🪝 A load of 800 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
38. 38.Which of these is a pulley? (a) a steering wheel (b) the tip of a nail (c) a seesaw (d) a well-bucket rope wheel
39. 39.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 4800 N box up it, in newtons? (ideal ramp, no friction)
40. 40.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?

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