Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 370 · 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: pressing a doorbell is a pull. (a) True (b) False
2. 2.⚖️ Which class of lever is a pair of scissors? (a) class 2 (b) class 3 (c) class 1
3. 3.⚖️ A lever bar balances. The load is 450 N at 10 cm from the fulcrum. The effort is 50 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.Which of these is a wheel and axle? (a) a bottle cap (b) a window blind cord (c) a well winch handle (d) a nut and bolt
5. 5.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the fulcrum (d) the effort
6. 6.🪝 More rope sections holding a load means … (a) more effort needed (b) less effort needed (c) no change (d) the load floats
7. 7.💪 Which force pulls everything towards the Earth? (a) magnetism (b) wind (c) friction (d) gravity
8. 8.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Ravi (180 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.💪 Is drawing up a well bucket a push or a pull? (a) a push (b) a pull
11. 11.True or false: opening a drawer is a push. (a) False (b) True
12. 12.💪 Which force is at work: brakes stop a bicycle? (a) gravity (b) friction (c) muscular force (d) magnetic force
13. 13.True or false: a pair of pliers is a class 2 lever (load in the middle). (a) False (b) True
14. 14.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
15. 15.True or false: a fixed pulley rises with the load. (a) True (b) False
16. 16.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 30 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
17. 17.🏋️ A longer ramp to the same height needs … (a) no effort (b) less effort (c) the same effort (d) more effort
18. 18.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
19. 19.⚙️ Which simple machine is a window blind cord? (a) pulley (b) wheel and axle (c) lever (d) screw
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
21. 21.⚖️ A seesaw balances. Ravi (170 N) sits ? m from the pivot on one side; Arjun (340 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, a glass sheet 3 N, a wooden plank 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
23. 23.🏋️ A force of 30 N pushes a cart 1 m along the floor. How much work is done, in joules?
24. 24.True or false: drawing up a well bucket is a pull. (a) False (b) True
25. 25.🏋️ A machine lifts a load of 1080 N when you push with 180 N. What is its mechanical advantage (MA)?
26. 26.True or false: a chisel is a pulley. (a) False (b) True
27. 27.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
28. 28.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
29. 29.🪝 A load of 580 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
30. 30.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
31. 31.🏋️ A force of 120 N pushes a cart 3 m along the floor. How much work is done, in joules?
32. 32.💪 Which force is at work: lifting a school bag? (a) muscular force (b) gravity (c) magnetic force (d) friction
33. 33.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) on the pivot (d) closer to the pivot
34. 34.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
35. 35.True or false: sand on a slippery path gives less friction. (a) True (b) False
36. 36.⚖️ A seesaw balances. Ravi (? N) sits 2 m from the pivot on one side; Asha (360 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.Which of these is caused by gravity? (a) rubbing hands warms them (b) an apple falls down (c) a fridge magnet sticks (d) shoes grip the floor
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
39. 39.🏋️ Pushing a crate 1 m took 280 J of work. What force was used, in newtons?
40. 40.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley

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