Name Chapter 14 Class Date Work, Power, and Machines Section 14.2 Work and Machines (pages 417 420) This section describes how machines change forces to make work easier to do. Input forces exerted.
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- Proceed to the Reading Strategy section on page 417. Summarize the main ideas for each machine in the table provided. After completing the table, write a summary sentence that conveys the overall concept illustrated.
- In the 'Machines Do Work' section, answer the questions by providing descriptions and examples based on the content discussed. Make sure to read each question carefully before answering.
- Move to the 'Work Input and Work Output' section. Answer the multiple-choice questions by circling the correct letter. Provide written answers for any open-ended questions as required.
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How can you increase a machine's work output?
The only way to increase the work output is to increase the work input. You can't get more work out of a machine than you put into it. The moving parts of a machine must use some of the work input to overcome friction. Because of friction, the work output of a machine is always less than the work input.
Does the jack used to lift the car increase or decrease the force applied to it?
Does the jack used to lift the car increase or decrease the force applied to it? Look at Figure 5. The jack increases the force applied to it.
Do machines increase the distance over which work is done?
Contrary to popular belief, machines do not increase the amount of work that is done. They just change how the work is done. Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied.
Can a car jack multiply the input of force?
A machine with a mechanical advantage greater than one multiplies force. Such machines can help you move or lift large objects, such as cars and heavy boxes, more easily. Jacks and many pulleys multiply force. A machine with a mechanical advantage of one does not multiply force.
Does a tire jack increase input force?
Increasing Force However, the distance you push the handle downward is greater than the distance the car is pushed upward. The jack increases the applied force, but doesn't increase the work done.
What is the ratio of output work to input work in a machine?
The efficiency of a machine compares output work to input work. The higher the percentage, the more efficient the machine is. Calculating Efficiency: To calculate the efficiency of a machine, divide the output work by the input work and multiply the result by 100 %.
How does the input distance of the machine compare to the output distance?
How does the input distance of the machine compare to its output distance? Because the output force is greater than the input force, the input distance must be greater than the output distance.
Does a tire jack increase or decrease input distance?
Tire jack Lug wrench Rowing oar Summary: As input force decreases, the input distance increases.
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