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Science= work

TermDefinition
Do machines decrease the amount of work needed for a task? Explain. No, machines make the work easier by changing the way work is done.
- does a machine make work easier? Yes.
Do machines decrease the amount of work done? They do not decrease the amount of work done. Instead, they can make work easier by changing the way which it is done.
Do you have to apply a force to an object for it to work? You must apply force to it. Like for a hammer. You have to apply a force to that to use it. This is the input force. The machine changes the input force into output force.
How does the hammer change the input force? The hammer changes the input force to output force using a smaller force over a long distance that would be required without a hammer.
- what is Input work? The work called input work W in. Input work is the product of the input force and the distance that the handle, or machine, moves in the direction of the input force.
What is the result of work? Movement.
What do machines do? Machines convert, or change, input work to output work. Machines apply an output force on an object.
What is the Output work? The output work, W out, is measured by multiplying the output force by the distance that part of the machine moves in the direction of the output force.
How do machines make work easier to do? It can change the size of the force. It can change the distance over which the force acts. It can change the direction of the force
Write the words that make the following sentence true. When a machine increases ____ ____, it is applied over a shorter _____ a= Input force b= Distance
How do you change the size of a force? The output force is greater than the input force, but it acts over a shorter distance.
How does a crowbar make work easier? It changes an Input force to an output force.
How do u change the direction of a force? The machine changes the direction of the applied force. In this case the Input force and the output force act over the same distance.
In what three ways do machines make doing work easier? - change the size - change the distance - change the direction.
What is a mechanical advantage? The ratio of a machine’s output force produced to the input force applied.
RaNdOm FaCt TiMe!! 🤪😜 Mechanical advantage can be less than 1, equal to 1, or greater than 1. A mechanical advantage greater than one means that the output force is greater than the input force.
What is efficiency? The ratio of he output work to the input work.
While raking up leaves, a woman applies an input force of 32 N to a rake. The rake has an output force of 16 N. What is the mechanical advantage of the rake? MA= 0.5 N
Why can’t the work be done by a machine be greater than the work done on the machine? Because friction always converts some of the input work to thermal energy.
What is the mechanical advantage equation? MA= Input Force/ output force
What is the equation for Efficiency? E= W out/ W in x %
Created by: LeoValdez
 

 



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