Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 306 · 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.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
2. 2.⚖️ A lever bar balances. The load is 280 N at 30 cm from the fulcrum. The effort is 210 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
3. 3.⚖️ A lever bar balances. The load is 360 N at ? cm from the fulcrum. The effort is 40 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
4. 4.⚙️ Which simple machine is an axe blade? (a) inclined plane (b) wedge (c) pulley (d) screw
5. 5.True or false: skating on ice gives less friction. (a) False (b) True
6. 6.🏋️ A machine lifts a load of 540 N when you push with 90 N. What is its mechanical advantage (MA)?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 7 N, a carpet 10 N, sandpaper 11 N, ice 3 N. How many newtons more were needed on sandpaper than on ice?
8. 8.⚙️ A screw is really … (a) a kind of wheel (b) a tiny pulley (c) a bent lever (d) a ramp wrapped round
9. 9.💪 Two children push a box to the right, one with 75 N and the other with 95 N. What is the net (total) force on the box, in newtons?
10. 10.🏋️ Work is done when a force moves something … (a) very slowly (b) only upwards (c) without moving it (d) through a distance
11. 11.💪 In a tug of war, one team pulls left with 55 N and the other pulls right with 5 N. What is the size of the net force, in newtons?
12. 12.🏋️ A 20 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.🪝 A load of 560 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) a glass sheet
15. 15.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 50 cm and the load at 30 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
16. 16.🪝 A pulley system has 3 rope sections holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
17. 17.True or false: drawing up a well bucket is a pull. (a) True (b) False
18. 18.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 2 (c) class 3
19. 19.🛞 More or less friction: a wheel on ball bearings? (a) more friction (b) less friction
20. 20.💪 Two children push a box to the right, one with 80 N and the other with 50 N. What is the net (total) force on the box, in newtons?
21. 21.Which of these is caused by magnetic force? (a) a river flows downhill (b) squeezing a lemon (c) a rolling ball slows (d) a magnet picks up pins
22. 22.⚖️ In a class 3 lever, what is in the middle? (a) the pulley (b) the load (c) the effort (d) the fulcrum
23. 23.⚖️ A seesaw balances. Meena (320 N) sits 2 m from the pivot on one side; Arjun (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
24. 24.⚖️ Along a straight bar, measured from the left end, the effort is at 60 cm, the fulcrum at 40 cm and the load at 20 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
25. 25.⚙️ How many simple machines are there in the usual list? (a) 12 (b) 10 (c) 6 (d) 3
26. 26.🪝 A load of 480 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
27. 27.💪 Which force is at work: lifting a school bag? (a) muscular force (b) friction (c) gravity (d) magnetic force
28. 28.True or false: a wood screw is a screw. (a) True (b) False
29. 29.⚙️ Which simple machine is a round doorknob? (a) pulley (b) wheel and axle (c) wedge (d) inclined plane
30. 30.True or false: a crane hook block is an inclined plane. (a) False (b) True
31. 31.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
32. 32.🏋️ A 9 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.⚖️ A lever bar balances. The load is 280 N at ? cm from the fulcrum. The effort is 200 N at 70 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.True or false: a pair of scissors is a class 1 lever (fulcrum in the middle). (a) False (b) True
35. 35.Which of these is caused by muscular force? (a) brakes stop a bicycle (b) lifting a school bag (c) an apple falls down (d) rain falls to the ground
36. 36.⚖️ Which class of lever is a pair of kitchen tongs? (a) class 1 (b) class 3 (c) class 2
37. 37.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
38. 38.🪝 Fixed or movable pulley: which one stays in one place? (a) a fixed pulley (b) a movable pulley
39. 39.True or false: a movable pulley hangs on the rope loop. (a) False (b) True
40. 40.🛞 How can we reduce friction in a machine? (a) oil the moving parts (b) press parts harder (c) add sand (d) make parts rough

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