Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 315 · 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.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) on the rock (b) on the fulcrum (c) far from the fulcrum (d) near the fulcrum
2. 2.🏋️ A 19 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Arjun (120 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
4. 4.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 760 N bucket on the axle, in newtons? (ideal)
5. 5.⚖️ A seesaw balances. Kabir (390 N) sits 3 m from the pivot on one side; Zoya (390 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
6. 6.💪 A box weighs 220 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
7. 7.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 20 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
8. 8.⚖️ A seesaw balances. Ravi (320 N) sits ? m from the pivot on one side; Zoya (640 N) sits 2 m from the pivot on the other side. What is the missing distance in metres?
9. 9.🛞 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 9 N, a glass sheet 1 N. Which surface gave the most friction? (a) a carpet (b) a wooden plank (c) sandpaper (d) a glass sheet
10. 10.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 20 N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
11. 11.⚖️ 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 3 (b) class 2 (c) class 1
12. 12.🏋️ A machine lifts a load of 100 N when you push with 50 N. What is its mechanical advantage (MA)?
13. 13.True or false: a smooth steel slide gives more friction. (a) True (b) False
14. 14.Which of these is caused by muscular force? (a) a magnet picks up pins (b) a compass needle turns (c) squeezing a lemon (d) an apple falls down
15. 15.🏋️ A force of 470 N did 3760 J of work. How many metres did the object move?
16. 16.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) farther from the pivot (c) closer to the pivot (d) anywhere
17. 17.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 200 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.⚙️ Which simple machine is a well winch handle? (a) lever (b) wheel and axle (c) inclined plane (d) screw
19. 19.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
20. 20.⚖️ A lever bar balances. The load is 200 N at 50 cm from the fulcrum. The effort is ? N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
21. 21.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Meena (450 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
22. 22.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
23. 23.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
24. 24.⚖️ A seesaw balances. Ravi (140 N) sits 4 m from the pivot on one side; Zoya (560 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
25. 25.🏋️ A force of 130 N pushes a cart 10 m along the floor. How much work is done, in joules?
26. 26.⚖️ A lever bar balances. The load is ? N at 30 cm from the fulcrum. The effort is 270 N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.⚙️ A wedge is … (a) a bar on a pivot (b) two ramps back to back (c) a wheel on a rod (d) a rope on a wheel
28. 28.🛞 More or less friction: a grippy rubber sole? (a) more friction (b) less friction
29. 29.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 1 (c) class 2
30. 30.True or false: sand on a slippery path gives less friction. (a) True (b) False
31. 31.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Ravi (240 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
32. 32.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
33. 33.Which of these is a pulley? (a) a round doorknob (b) a bottle cap (c) a knife edge (d) a flagpole rope wheel
34. 34.Which of these is caused by friction? (a) lifting a school bag (b) a magnet picks up pins (c) shoes grip the floor (d) an apple falls down
35. 35.🪝 A winch has a wheel of radius 10 cm and an axle of radius 5 cm. What effort on the wheel lifts a 220 N bucket on the axle, in newtons? (ideal)
36. 36.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
37. 37.True or false: a water tap handle is a wheel and axle. (a) False (b) True
38. 38.🏋️ A longer ramp to the same height needs … (a) the same effort (b) no effort (c) more effort (d) less effort
39. 39.⚖️ 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 3 (c) class 2
40. 40.⚙️ Which simple machine is a wood screw? (a) wedge (b) lever (c) screw (d) wheel and axle

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