Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 524 · 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.💪 In a tug of war, one team pulls left with 50 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
2. 2.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 640 N bucket on the axle, in newtons? (ideal)
3. 3.🪝 A pulley system lifts a 400 N load with an effort of 100 N. What is its mechanical advantage (MA)?
4. 4.💪 A box weighs 340 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
5. 5.⚖️ A lever bar balances. The load is 630 N at 20 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
6. 6.True or false: a bottle opener is a class 1 lever (fulcrum in the middle). (a) True (b) False
7. 7.🏋️ Mechanical advantage (MA) = … (a) load + effort (b) effort ÷ load (c) load × effort (d) load ÷ effort
8. 8.🪝 A well winch has a handle (wheel) of radius 9 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
9. 9.True or false: a movable pulley needs effort = load. (a) True (b) False
10. 10.💪 A bag has a mass of 44 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
11. 11.💪 A force is a … (a) unit of time (b) kind of colour (c) push or a pull (d) type of sound
12. 12.🪝 More rope sections holding a load means … (a) the load floats (b) more effort needed (c) less effort needed (d) no change
13. 13.⚖️ A lever bar balances. The load is 150 N at 40 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 70 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
15. 15.True or false: hitting a cricket ball is a pull. (a) False (b) True
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1
17. 17.⚙️ Which simple machine is a window blind cord? (a) screw (b) wedge (c) pulley (d) inclined plane
18. 18.⚖️ A seesaw balances. Arjun (150 N) sits ? m from the pivot on one side; Ravi (450 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
19. 19.⚖️ A seesaw balances. Ravi (480 N) sits 1 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.💪 In a tug of war, one team pulls left with 65 N and the other pulls right with 45 N. What is the size of the net force, in newtons?
21. 21.Which of these is a screw? (a) a wheelchair ramp (b) a bottle cap (c) a crane hook block (d) a chisel
22. 22.🏋️ A machine lifts a load of 40 N when you push with 20 N. What is its mechanical advantage (MA)?
23. 23.🪝 A bucket weighing 320 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.True or false: a jar lid is a lever. (a) True (b) False
25. 25.🛞 More or less friction: a wet tiled floor? (a) less friction (b) more friction
26. 26.⚖️ A seesaw balances. Kabir (? N) sits 3 m from the pivot on one side; Zoya (300 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
27. 27.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) friction (c) muscular force (d) magnetic force
28. 28.⚙️ Which simple machine is a crowbar? (a) lever (b) inclined plane (c) wedge (d) wheel and axle
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, ice 4 N, a glass sheet 5 N, a carpet 6 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) a carpet (d) ice
30. 30.⚖️ A seesaw balances. Asha (180 N) sits 1 m from the pivot on one side; Meena (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.🪝 A load of 280 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
32. 32.🪝 A winch has a wheel of radius 6 cm and an axle of radius 3 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
33. 33.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
34. 34.💪 Is pressing a doorbell a push or a pull? (a) a push (b) a pull
35. 35.🏋️ Pushing a crate 4 m took 1680 J of work. What force was used, in newtons?
36. 36.💪 In a tug of war, one team pulls left with 85 N and the other pulls right with 80 N. What is the size of the net force, in newtons?
37. 37.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 200 N box up it, in newtons? (ideal ramp, no friction)
38. 38.⚖️ A lever bar balances. The load is 360 N at 40 cm from the fulcrum. The effort is 160 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
39. 39.Which of these is caused by magnetic force? (a) a compass needle turns (b) rubbing hands warms them (c) a rolling ball slows (d) a thrown ball comes down
40. 40.💪 Two children push a box to the right, one with 70 N and the other with 25 N. What is the net (total) force on the box, in newtons?

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