Unit D Section D2 Self-Check Quiz
Completion requirements
Make sure you have understood everything in this section (Lessons D4, D5, D6, D7, and D8).
Use the Self-Check below, and the Self-Check & Lesson Review Tips to guide your learning.
This is also a good time to visit your Section 2 Checklist to make sure you have completed all the recommended learning activities.
Use the Self-Check below, and the Self-Check & Lesson Review Tips to guide your learning.
This is also a good time to visit your Section 2 Checklist to make sure you have completed all the recommended learning activities.
Unit D Section 2 Self-Check
Instructions
Complete the following 6 steps.
Don't skip steps – if you do them in order, you will confirm your
understanding of this section and create a study bank for the future.
- DOWNLOAD the self-check quiz by clicking here.
- ANSWER all the questions on the downloaded quiz in the spaces provided. Think carefully before typing your answers. Review the lessons of this section if you need to. Save your quiz when you are done.
- COMPARE your answers with the suggested "Self-Check Quiz Answers" below. WAIT! You didn't skip step 2, did you? It's very important to carefully write out your own answers before checking the suggested answers.
-
REVISE your quiz answers if you need to. If you answered all the questions correctly, you can skip this step. Revise means to change, fix, and add extra notes if you need to. This quiz is NOT FOR MARKS, so it is perfectly OK to correct
any mistakes you made. This will make your self-check quiz an excellent study tool you can use later.
- SAVE your quiz to a folder on your computer, or to your Private Files. That way you will know where it is for later studying.
- CHECK with your teacher if you need to. If after completing all these steps you are still not sure about the questions or your answers, you should ask for more feedback from your teacher. To do this, post in the Course Questions Forum, or send your teacher an email. In either case, attach your completed quiz and ask; "Can you look at this quiz and give me some feedback please?" They will be happy to help you!
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Self-Check Quiz Answers
Click each of the suggested answers below, and carefully compare your answers to the suggested answers.
If you have not done the quiz yet – STOP – and go back to step 1 above. Do not look at the answers without first trying the questions.
Work equals force times distance (W = F x d).
The force of 800 N multiplied by the distance of 1.5 m equals 1200 J (W = 800 N x 1.5 m = 1200 J).
The force of 800 N multiplied by the distance of 1.5 m equals 1200 J (W = 800 N x 1.5 m = 1200 J).
Even though some machines are very efficient, no machine is ever 100% efficient because the force of friction causes some of the input work to be converted to heat and sound energy.
Mechanical advantage is equal to the output force divided by the input force. The output force of 600 N (the force required to lift the mass) divided by the input force of 400 N (the force used with the machine) is equal to a mechanical advantage
of 1.5.
According to Pascal’s Law, the pressure applied to a hydraulic system is transferred equally throughout the system. Pressure is equal to force divided by area (P = F/A). A small input force over a small area applies pressure to the hydraulic
system. Because this applied pressure stays the same throughout the system, if you want the output piston to deliver a larger force than the input piston, the area of the output piston must also be larger than the input piston.
In order to find the mechanical advantage of the hydraulic system, you must know the output force and the input force. The input force is given to you (8 N), but you must determine the output force before you can calculate mechanical advantage.
Pressure is equal to force divided by area (P = F/A). The pressure applied to the system equals 8 N of input force divided by 2 m2 area on the input piston, to get 4 Pa of pressure applied to the hydraulic system, including on the output piston.
On the output piston, pressure equals force divided by area. The output force divided by the output piston area of 12 m2 must be equal to 4 Pa. What number divided by 12 equals 4? 48 N of output force divided by 12 equals 4 Pa.
Another way to solve for the output force is using a ratio. Pressure at the input piston is the same as pressure at the output piston, which means we can state the following ratio:
If we put the appropriate numbers in the ratio and solve the missing output piston force (X), we get the following:
The mechanical advantage of the hydraulic system is equal to the output force divided by the input force. The output force of 48 N divided by the input force of 8 N equals a mechanical advantage of 6.
Pressure is equal to force divided by area (P = F/A). The pressure applied to the system equals 8 N of input force divided by 2 m2 area on the input piston, to get 4 Pa of pressure applied to the hydraulic system, including on the output piston.
On the output piston, pressure equals force divided by area. The output force divided by the output piston area of 12 m2 must be equal to 4 Pa. What number divided by 12 equals 4? 48 N of output force divided by 12 equals 4 Pa.
Another way to solve for the output force is using a ratio. Pressure at the input piston is the same as pressure at the output piston, which means we can state the following ratio:
If we put the appropriate numbers in the ratio and solve the missing output piston force (X), we get the following:
The mechanical advantage of the hydraulic system is equal to the output force divided by the input force. The output force of 48 N divided by the input force of 8 N equals a mechanical advantage of 6.