Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 102 · 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.🏋️ Mechanical advantage (MA) = … (a) load ÷ effort (b) load × effort (c) load + effort (d) effort ÷ load
2. 2.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a wheel on ball bearings (c) skating on ice (d) a grippy rubber sole
3. 3.🔍 Which is the odd one out? (a) a crowbar (b) a claw hammer on a nail (c) a jar lid (d) a nutcracker
4. 4.True or false: a seesaw is a class 1 lever (fulcrum in the middle). (a) True (b) False
5. 5.💪 A bag has a mass of 47 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
6. 6.🪝 A pulley system has 2 rope sections holding up the load. To lift the load by 1 m, how many metres of rope must you pull?
7. 7.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
8. 8.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
9. 9.True or false: a bottle cap is a pulley. (a) True (b) False
10. 10.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
11. 11.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 20 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
12. 12.💪 Is pushing a swing a push or a pull? (a) a push (b) a pull
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 6 N, a wooden plank 10 N, sandpaper 14 N, ice 2 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
14. 14.⚙️ Which simple machine is a bottle cap? (a) wheel and axle (b) pulley (c) inclined plane (d) screw
15. 15.🪝 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)
16. 16.⚖️ A seesaw balances. Asha (? N) sits 2 m from the pivot on one side; Zoya (220 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
17. 17.⚖️ A lever balances when … (a) the bar is short (b) turning effects match (c) the fulcrum moves (d) both weights are equal
18. 18.⚖️ A seesaw balances. Asha (440 N) sits 2 m from the pivot on one side; Kabir (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
19. 19.⚖️ On a seesaw, a heavier child should sit … (a) farther from the pivot (b) anywhere (c) closer to the pivot (d) on the pivot
20. 20.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a rope on a wheel (d) a bar on a pivot
21. 21.⚙️ A screw is really … (a) a tiny pulley (b) a ramp wrapped round (c) a kind of wheel (d) a bent lever
22. 22.🏋️ Work is done when a force moves something … (a) very slowly (b) through a distance (c) without moving it (d) only upwards
23. 23.True or false: a well winch handle is a wheel and axle. (a) True (b) False
24. 24.Which of these is a screw? (a) a chisel (b) a seesaw (c) a crane hook block (d) a screw jack
25. 25.⚖️ Which class of lever is a crowbar? (a) class 1 (b) class 3 (c) class 2
26. 26.True or false: a wood screw is a wheel and axle. (a) False (b) True
27. 27.🪝 A bucket weighing 480 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
28. 28.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 180 N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
29. 29.⚙️ Which simple machine is a chisel? (a) lever (b) screw (c) wheel and axle (d) wedge
30. 30.Which of these is a screw? (a) a window blind cord (b) a jar lid (c) the tip of a nail (d) a chisel
31. 31.True or false: a grippy rubber sole gives less friction. (a) False (b) True
32. 32.True or false: a movable pulley rises with the load. (a) False (b) True
33. 33.⚖️ A seesaw balances. Meena (140 N) sits ? m from the pivot on one side; Asha (420 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
34. 34.⚖️ Going along a lever from one end to the other, the order is: fulcrum, load, effort. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
35. 35.🏋️ In which unit is work measured? (a) newton (N) (b) metre (m) (c) watt hour (d) joule (J)
36. 36.⚖️ A seesaw balances. Asha (200 N) sits 4 m from the pivot on one side; Meena (? N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
37. 37.🪝 A winch has a wheel of radius 5 cm and an axle of radius 1 cm. What effort on the wheel lifts a 250 N bucket on the axle, in newtons? (ideal)
38. 38.⚖️ Along a straight bar, measured from the left end, the effort is at 90 cm, the fulcrum at 70 cm and the load at 30 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
39. 39.Which of these is caused by gravity? (a) a magnet picks up pins (b) a compass needle turns (c) a thrown ball comes down (d) a rolling ball slows
40. 40.💪 A box weighs 110 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?

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