Work and Power
It is the rate at which work is done
Power
They help to make work easier
Machines
What is the ideal mechanical advantage of an inclined plane with a height of 2 m and a length of 10 m?
5
How do you find the mechanical advantage of a wheel and axle?
Radius of wheel / radius of axle
It is the energy of stretched things
Elastic potential energy
It is the unit of work
Joule
The force you exert on a machine
Input force
It is an inclined plane wrapped around a cylinder.
a screw
How do you find the mechanical advantage of a compound machine?
Multiply the MA of all of the simple machines together
It is the sum of kinetic and potential energy
Mechanical energy
Work is only done when...
The force and motion are parallel
Output force divided by input force =
mechanical advantage
A lever whose fulcrum is between the input and output forces
1st class
The ability to do work
Energy
It says that energy is never created or destroyed
law of conservation of energy
Watt are the units of power
Exactly
What is the output force if the input force is 5N and the mechanical advantage is 12?
60N
A lever that always reduces your force
third class lever
The transfer of energy
work
The energy of the particles in an object
thermal energy
power = (force x distance)/(?)
? =
time
What is the formula for mechanical efficiency?
(Output work / input work) X 100%
A lever that always has the output force between the fulcrum and the input force
2nd class
What is the formula for kinetic energy?
1/2MV2
This form of energy that can travel through a vacuum
electromagnetic