Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 390 · 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.🏋️ A force of 460 N pushes a cart 6 m along the floor. How much work is done, in joules?
2. 2.🪝 A winch has a wheel of radius 21 cm and an axle of radius 3 cm. What effort on the wheel lifts a 1050 N bucket on the axle, in newtons? (ideal)
3. 3.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 0 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
4. 4.🛞 How can we reduce friction in a machine? (a) press parts harder (b) oil the moving parts (c) add sand (d) make parts rough
5. 5.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
6. 6.🔍 Which is the odd one out? (a) a road up a hill (b) a wheelchair ramp (c) a door stopper (d) a truck loading ramp
7. 7.💪 Which force is at work: rain falls to the ground? (a) muscular force (b) friction (c) gravity (d) magnetic force
8. 8.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 1900 N box up it, in newtons? (ideal ramp, no friction)
9. 9.⚖️ A seesaw balances. Ravi (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?
10. 10.⚙️ Which simple machine is an axe blade? (a) wedge (b) screw (c) pulley (d) wheel and axle
11. 11.⚖️ A lever bar balances. The load is 540 N at 50 cm from the fulcrum. The effort is 300 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
12. 12.True or false: a movable pulley rises with the load. (a) True (b) False
13. 13.🏋️ A machine lifts a load of 780 N when you push with 130 N. What is its mechanical advantage (MA)?
14. 14.⚖️ On a seesaw, a heavier child should sit … (a) on the pivot (b) anywhere (c) farther from the pivot (d) closer to the pivot
15. 15.⚖️ A lever bar balances. The load is 500 N at 10 cm from the fulcrum. The effort is ? N at 50 cm from the fulcrum on the other side. What is the missing force in newtons?
16. 16.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
17. 17.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
18. 18.🛞 More or less friction: skating on ice? (a) less friction (b) more friction
19. 19.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
20. 20.🔍 Which is the odd one out? (a) a seesaw (b) a round doorknob (c) a bottle opener (d) a crowbar
21. 21.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
22. 22.⚖️ Turning effect = force × … (a) mass of fulcrum (b) time taken (c) distance from fulcrum (d) colour of bar
23. 23.True or false: a movable pulley halves the effort. (a) False (b) True
24. 24.🪝 A pulley system lifts a 640 N load with an effort of 160 N. What is its mechanical advantage (MA)?
25. 25.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
26. 26.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
27. 27.🏋️ A force of 20 N did 20 J of work. How many metres did the object move?
28. 28.🪝 Fixed or movable pulley: which one makes you pull 2× rope? (a) a movable pulley (b) a fixed pulley
29. 29.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to go slower (c) to grip the road (d) to look nice
30. 30.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 2750 N box up it, in newtons? (ideal ramp, no friction)
31. 31.🔍 Which is the odd one out? (a) a water tap handle (b) a crowbar (c) a seesaw (d) a bottle opener
32. 32.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
33. 33.True or false: a fixed pulley only changes direction. (a) True (b) False
34. 34.⚙️ Which simple machine is a water tap handle? (a) lever (b) wheel and axle (c) inclined plane (d) pulley
35. 35.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the effort (c) nothing (d) the load
36. 36.Which of these is caused by magnetic force? (a) a compass needle turns (b) lifting a school bag (c) brakes stop a bicycle (d) squeezing a lemon
37. 37.⚖️ A lever bar balances. The load is 240 N at ? cm from the fulcrum. The effort is 240 N at 30 cm from the fulcrum on the other side. What is the missing distance in centimetres?
38. 38.⚙️ Most simple machines make work easier by letting us … (a) switch off gravity (b) make new energy (c) stop all friction (d) use a smaller force
39. 39.True or false: a tyre with deep treads gives more friction. (a) False (b) True
40. 40.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2

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