Energy, Work, And Power Flashcards
What is energy
Energy is the ability to do work
What is work
Work is done when when energy is transferred or transformed from one form Ito another
What is power
The rate of doing work
Describe the energy transfers done when a ball is dropped
CBa for now
What is the conservation of enery principle
Energy cannot be gained or lost, it can only be transformed from one form into another
What is power measured in
Watts (W)
Equation for power
P= work done/ time taken
Efficiency equation
Useful energy output / total energy output x 100
What is the equation for KE
KE = 1/2 m (v)^2
GPE =
Mgh
Mass x gravity x height
What is absolute zero
The point where a gas has the least amount of KE and pressure has stopped decreasing . At -273 degrees celcius
What is another name for -273degress celcius
Absolute zero
Kelvin temp scale starts from
-273 degrees celcius
What is resultant force
The net overall force acting on a body
Forces can do what four things
Change Direction Speed Size Shape
What is Newton’s second law
The acceleration of an object is directly proportional to the resultant force acting on it
What equation works out work
Work = force x distance
What is kinetic energy
The energy possessed by moving objects
How to work out force
Fore = mass x acceleration
How can I work out average kinetic energy of a gases molecules
Kelvin temp scale is proportional to the av kinetic energy of the gas
