Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 751 · 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 is the odd one out? (a) a nut and bolt (b) a window blind cord (c) a wood screw (d) a screw jack
2. 2.💪 Is hitting a cricket ball a push or a pull? (a) a pull (b) a push
3. 3.⚖️ A seesaw balances. Ravi (540 N) sits 1 m from the pivot on one side; Asha (180 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.⚖️ Which class of lever is a pair of scissors? (a) class 3 (b) class 2 (c) class 1
5. 5.True or false: plucking a mango is a pull. (a) True (b) False
6. 6.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) False (b) True
7. 7.True or false: a movable pulley rises with the load. (a) True (b) False
8. 8.🪝 A pulley system lifts a 280 N load with an effort of 140 N. What is its mechanical advantage (MA)?
9. 9.⚖️ A lever bar balances. The load is 60 N at ? cm from the fulcrum. The effort is 40 N at 60 cm from the fulcrum on the other side. What is the missing distance in centimetres?
10. 10.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) two ramps back to back (d) a wheel on a rod
11. 11.💪 Which force is at work: a fridge magnet sticks? (a) gravity (b) muscular force (c) magnetic force (d) friction
12. 12.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
13. 13.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
15. 15.🪝 A bucket weighing 280 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 30 cm and the load at 10 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
17. 17.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 8 N, ice 1 N, a glass sheet 2 N. Which surface gave the least friction? (a) ice (b) a carpet (c) a wooden plank (d) a glass sheet
19. 19.⚖️ Turning effect = force × … (a) distance from fulcrum (b) mass of fulcrum (c) colour of bar (d) time taken
20. 20.⚖️ A lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 100 N at 100 cm from the fulcrum on the other side. What is the missing distance in centimetres?
21. 21.True or false: a crowbar is a class 3 lever (effort in the middle). (a) False (b) True
22. 22.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
23. 23.⚙️ Which simple machine is a road up a hill? (a) pulley (b) lever (c) screw (d) inclined plane
24. 24.🏋️ A force of 290 N did 2900 J of work. How many metres did the object move?
25. 25.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
26. 26.🪝 A load of 200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
27. 27.🪝 Fixed or movable pulley: which one stays in one place? (a) a movable pulley (b) a fixed pulley
28. 28.⚖️ A seesaw balances. Asha (440 N) sits 1 m from the pivot on one side; Zoya (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
29. 29.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 60 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?
30. 30.⚖️ A seesaw balances. Kabir (640 N) sits 4 m from the pivot on one side; Ravi (640 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
31. 31.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
32. 32.Which of these is caused by friction? (a) a fridge magnet sticks (b) an apple falls down (c) a rolling ball slows (d) pedalling a cycle
33. 33.⚖️ A seesaw balances. Asha (800 N) sits ? m from the pivot on one side; Meena (200 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ A lever bar balances. The load is 400 N at 10 cm from the fulcrum. The effort is 100 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
35. 35.⚖️ A seesaw balances. Zoya (? N) sits 1 m from the pivot on one side; Ravi (120 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a glass sheet 3 N, a wooden plank 5 N, sandpaper 6 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) sandpaper (d) a glass sheet
37. 37.True or false: a pair of tweezers is a class 3 lever (effort in the middle). (a) True (b) False
38. 38.⚙️ Which simple machine is a claw hammer on a nail? (a) inclined plane (b) lever (c) wedge (d) screw
39. 39.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 70 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
40. 40.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2

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