Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 808 · 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 nutcracker? (a) class 3 (b) class 1 (c) class 2
2. 2.True or false: kicking a football is a push. (a) False (b) True
3. 3.🪝 A bucket weighing 200 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
4. 4.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 40 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
5. 5.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) helpful (b) a problem
6. 6.💪 A box weighs 360 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.🏋️ Pushing a crate 1 m took 270 J of work. What force was used, in newtons?
8. 8.💪 A box weighs 330 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
9. 9.⚖️ In a class 2 lever, what is in the middle? (a) the axle (b) the load (c) the effort (d) the fulcrum
10. 10.🏋️ Pushing a crate 4 m took 1320 J of work. What force was used, in newtons?
11. 11.🏋️ Pushing a crate 7 m took 2380 J of work. What force was used, in newtons?
12. 12.Which of these is a wedge? (a) a wood screw (b) an axe blade (c) a playground slide (d) a seesaw
13. 13.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
14. 14.🪝 A load of 1160 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a sharp wedge (c) a smaller rod (axle) (d) a flat ramp
16. 16.🏋️ A force of 270 N pushes a cart 2 m along the floor. How much work is done, in joules?
17. 17.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) helpful (b) a problem
18. 18.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
19. 19.🏋️ A force of 90 N did 360 J of work. How many metres did the object move?
20. 20.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 1 (c) class 2
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 6 N, a glass sheet 1 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
22. 22.⚖️ A seesaw balances. Kabir (200 N) sits ? m from the pivot on one side; Meena (300 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
23. 23.🪝 More rope sections holding a load means … (a) more effort needed (b) the load floats (c) less effort needed (d) no change
24. 24.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
25. 25.⚙️ Which simple machine is a knife edge? (a) wedge (b) wheel and axle (c) pulley (d) screw
26. 26.True or false: pressing a doorbell is a push. (a) True (b) False
27. 27.💪 A bag has a mass of 41 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
28. 28.💪 A box weighs 120 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
29. 29.True or false: a flagpole rope wheel is a pulley. (a) False (b) True
30. 30.🪝 A pulley system lifts a 540 N load with an effort of 180 N. What is its mechanical advantage (MA)?
31. 31.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
32. 32.True or false: pushing a swing is a push. (a) False (b) True
33. 33.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Asha (180 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
34. 34.True or false: a movable pulley only changes direction. (a) True (b) False
35. 35.🏋️ A force of 100 N did 100 J of work. How many metres did the object move?
36. 36.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
37. 37.Which of these is caused by gravity? (a) a magnet picks up pins (b) brakes stop a bicycle (c) a compass needle turns (d) a river flows downhill
38. 38.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 30 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
39. 39.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a fixed pulley (b) a movable pulley
40. 40.⚖️ A seesaw balances. Arjun (? N) sits 3 m from the pivot on one side; Meena (480 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?

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