Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 557 · 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 which unit is work measured? (a) metre (m) (b) watt hour (c) joule (J) (d) newton (N)
2. 2.🏋️ A 19 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
3. 3.🏋️ A 4 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
4. 4.⚖️ A lever balances when … (a) the bar is short (b) the fulcrum moves (c) both weights are equal (d) turning effects match
5. 5.🛞 Friction acts … (a) against the motion (b) only on ice (c) with the motion (d) only upwards
6. 6.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 150 N box up it, in newtons? (ideal ramp, no friction)
7. 7.💪 A box weighs 460 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
8. 8.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Kabir (190 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
9. 9.⚙️ Which simple machine is a steering wheel? (a) lever (b) wheel and axle (c) inclined plane (d) wedge
10. 10.⚖️ A lever bar balances. The load is 40 N at 30 cm from the fulcrum. The effort is 30 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
11. 11.🪝 A load of 480 N hangs from a pulley system in which 2 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
12. 12.Which of these is a lever? (a) a flagpole rope wheel (b) a steering wheel (c) a truck loading ramp (d) a nutcracker
13. 13.🛞 More or less friction: chalk on a gym bar? (a) less friction (b) more friction
14. 14.⚖️ A lever bar balances. The load is 80 N at ? cm from the fulcrum. The effort is 120 N at 20 cm from the fulcrum on the other side. What is the missing distance in centimetres?
15. 15.True or false: pushing a trolley is a pull. (a) True (b) False
16. 16.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) only upwards (d) through a distance
17. 17.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
18. 18.Which of these is a pulley? (a) a wood screw (b) a knife edge (c) a crane hook block (d) a crowbar
19. 19.🪝 Fixed or movable pulley: which one rises with the load? (a) a movable pulley (b) a fixed pulley
20. 20.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
21. 21.True or false: a box pushed on carpet gives less friction. (a) False (b) True
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a carpet 4 N, sandpaper 8 N, ice 1 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
23. 23.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 70 cm and the load at 90 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 9 N, a carpet 12 N, ice 1 N. Which surface gave the least friction? (a) a wooden plank (b) a carpet (c) a glass sheet (d) ice
26. 26.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) True (b) False
27. 27.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) ice (c) polished marble (d) glass
28. 28.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 70 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
29. 29.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
30. 30.⚖️ 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
31. 31.True or false: a movable pulley is on a flagpole top. (a) True (b) False
32. 32.🏋️ Pushing a crate 1 m took 220 J of work. What force was used, in newtons?
33. 33.💪 Is a tug of war a push or a pull? (a) a push (b) a pull
34. 34.⚖️ A seesaw balances. Zoya (300 N) sits 1 m from the pivot on one side; Asha (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
35. 35.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) anywhere (c) farther from the pivot (d) on the pivot
36. 36.🔍 Which is the odd one out? (a) a well winch handle (b) a wood screw (c) a round doorknob (d) a steering wheel
37. 37.💪 Two children push a box to the right, one with 20 N and the other with 55 N. What is the net (total) force on the box, in newtons?
38. 38.Which of these is caused by friction? (a) squeezing a lemon (b) a river flows downhill (c) a rolling ball slows (d) rain falls to the ground
39. 39.⚖️ Which class of lever is a pair of tweezers? (a) class 3 (b) class 1 (c) class 2
40. 40.Which of these is a screw? (a) a wood screw (b) a nutcracker (c) a knife edge (d) a window blind cord

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