energy stores and transfers

what does the law of conservation of energy state?

Energy cannot be created or destroyed, it can only be transferred between different energy stores.

what is the equation for efficiency?

efficiency = useful energy output/total energy input

What is the equation for kinetic energy, mass and speed?

KE = ½ x m x v(2)

What is the equation for gravitational potential energy?

🔺GPE = m x g x 🔺h

What does h mean in 🔺GPE = m x g x 🔺h ?

Change in height (m)

What does g stand for in 🔺GPE = m x g x 🔺h ?

gravitational field strength (N/kg)

What does m stand for in 🔺GPE = m x g x 🔺h ?

mass (kg)

What does v stand for in KE = ½ x m x v(2) ?

speed (m/s)

What does m stand for in KE = ½ x m x v(2) ?

mass (kg)

What is energy measured in?

Joules (J)

What is a system ?

An object or objects where work is being done

What is a closed system ?

Where the total energy of the system is constant (ie the efficiency is 100%)

What are some of the energy stores ?

Thermal(internal), kinetic, gravitational potential, elastic potential, magnetic, electrostatic, nuclear, chemical