Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 252 · 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.🪝 More rope sections holding a load means … (a) more effort needed (b) no change (c) less effort needed (d) the load floats
2. 2.🛞 How can we reduce friction in a machine? (a) make parts rough (b) add sand (c) press parts harder (d) oil the moving parts
3. 3.⚖️ A seesaw balances. Arjun (400 N) sits 2 m from the pivot on one side; Zoya (400 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
4. 4.🏋️ Pushing a crate 10 m took 1600 J of work. What force was used, in newtons?
5. 5.True or false: a crane hook block is a lever. (a) False (b) True
6. 6.💪 Is opening a drawer a push or a pull? (a) a push (b) a pull
7. 7.🪝 Fixed or movable pulley: which one halves the effort? (a) a movable pulley (b) a fixed pulley
8. 8.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) stop all friction (c) use a smaller force (d) make new energy
9. 9.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
10. 10.🏋️ A force of 460 N did 2300 J of work. How many metres did the object move?
11. 11.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
12. 12.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
13. 13.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a smooth steel slide (c) a wet tiled floor (d) a rough doormat
14. 14.⚙️ Which simple machine is a screw jack? (a) lever (b) pulley (c) screw (d) wedge
15. 15.True or false: a broom when sweeping is a class 3 lever (effort in the middle). (a) True (b) False
16. 16.🏋️ A machine lifts a load of 270 N when you push with 90 N. What is its mechanical advantage (MA)?
17. 17.💪 Is pressing a doorbell a push or a pull? (a) a pull (b) a push
18. 18.Which of these is a wedge? (a) a claw hammer on a nail (b) a bottle cap (c) a door stopper (d) a wheelchair ramp
19. 19.🪝 A load of 810 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.🏋️ A smooth ramp is 6 m long and rises 3 m. What effort pushes a 100 N box up it, in newtons? (ideal ramp, no friction)
21. 21.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
22. 22.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
23. 23.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
24. 24.⚖️ A lever bar balances. The load is 480 N at 30 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.True or false: a rough doormat gives more friction. (a) False (b) True
26. 26.⚙️ A wedge is … (a) a bar on a pivot (b) a rope on a wheel (c) a wheel on a rod (d) two ramps back to back
27. 27.True or false: pushing a trolley is a push. (a) False (b) True
28. 28.💪 Which force is at work: squeezing a lemon? (a) gravity (b) muscular force (c) friction (d) magnetic force
29. 29.🔍 Which is the odd one out? (a) a playground slide (b) a bottle opener (c) a truck loading ramp (d) a wheelchair ramp
30. 30.🏋️ In which unit is work measured? (a) metre (m) (b) joule (J) (c) watt hour (d) newton (N)
31. 31.🪝 A bucket weighing 150 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.True or false: a fixed pulley rises with the load. (a) True (b) False
33. 33.True or false: drawing up a well bucket is a pull. (a) True (b) False
34. 34.💪 A bag has a mass of 38 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
35. 35.⚖️ A seesaw balances. Asha (570 N) sits 2 m from the pivot on one side; Arjun (380 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
36. 36.🏋️ A smooth ramp is 4 m long and rises 1 m. What effort pushes a 3600 N box up it, in newtons? (ideal ramp, no friction)
37. 37.⚖️ A seesaw balances. Arjun (360 N) sits 2 m from the pivot on one side; Meena (? N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
39. 39.True or false: a well winch handle is a wheel and axle. (a) False (b) True
40. 40.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 2 (c) class 1

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