Energy - Forces Doing Worm Flashcards
What is a closed system?
A system that experienced no net change to its total energy when energy transfers occur within it
What’s dissipation of energy..
Energy transfer to surroundings
What’s power?
Equation?
The rate at which energy is transfered
Power = Work done / time taken
What’s a watt?
Whats it equal to?
Unit of power
Equal to one joule per second
Can energy be created or destroyed?
Energy never created or destroyed, only transfered
What happens to energy when a system changes?
Energy is transfered from one form to another
What’s the gpe equation?
Change in GPE= mass X gravity X change in height
What’s the kinetic energy equation?
Ke= 1/2 X mass X v^2
What happens to the energy in a closed system? Example …
It remains the same at all times
Eg: sky diver
What’s a work done energy change?
When an external force transfers energy to a system.
What’s the electric change in energy?
Chemical potential energy( stored in batteries) forms electric
How does electric energy transfer to thermal energy
Electric transfers to thermal energy , as work is done against the coils, heating them up
Work done equation..
Work done = force (N)X distance moved in direction of force (m)
How is energy wasted?
It’s dissipated and stored in less useful ways
How does friction lead to energy waste?
Energy is dissipated as heat, causing a rise in temp and energy lost to surroundings
