What do Machines do?
What is Mechanical advantage
What is Efficiency
All about inclined planes
Classifying Levers
100
What is what makes work easier by changing force, distance, and direction?
Machine
100
What is the number of times a machine increases a force exerted on it?
Mechanical advantage
100
What is Efficiency?
It compares output work to input work
100
What is the most basic device for making work easier?
A Simple machine
100
What is a rigid bar that is free to rotate on a fixed point?
A lever
200
What is the force you exert when you do work
Input force
200
What is The ratio of output force to input force
Mechanical advantage
200
What is the calculation for efficiency?
Divide the output work by the input work and multiply the result by 100 percent
200
What is a device that is thick at one end and tapers to a thin edge at the other end?
A wedge
200
What is the fixed point that a rigid bar rotates freely on?
Fulcrum
300
output force What is the work the machine exerts?
output force
300
What is the formula for finding the mechanical advantage
output force divided by the input force
300
What is the cause of all machines loosing work?
Friction
300
What is a flat, sloped surface that allows you to exert your input force over a longer distance?
An inclined Plane
300
What is the formula for finding the ideal mechanical advantage of a lever?
ideal mechanical advantage equals distance from fulcrum to input force divided by distance from fulcrum to output force
400
What is the formula for doing work?
Force X Distance
400
What is the mechanical advantage when a machine increases force and the output force is greater than the input force?
Greater than 1
400
What is a machine with an efficiency of 100 percent?
An ideal machine
400
What is like an inclined plane wrapped around a cylinder?
A screw
400
What three groups are levers divided into? And describe each group.
First class: change the direction Second Class: increase force Third Class: increase distance
500
How do machines make work easier? ( 3 ways)
By changing the force, distance, or direction
500
What is the mechanical advantage when a machine increases distance and the output force is less than the input force?
The mechanical advantage is less than 1
500
What is the reason that ideal machines do not exist?
Because all machines loose work due to friction
500
What is one way that inclined planes and screws are similar and one way they are different?
Both invlove sloped surfaces, but screws move and are wrapped around cylinders
500
Explain how to increase the mechanical advantage of inclined planes and levers
inclined plane: make the plane longer and less steep Lever: increase the distance between the fulcrum and the input force
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