Edexcel A Level Physics:复习笔记2.19 Gravitational Potential Energy

• Gravitational potential energy (usually written Ep, but sometimes GPE) is energy stored in a mass due to its position in a gravitational field
  • If a mass is lifted up, it will gain Ep (converted from other forms of energy)
  • If a mass falls, it will lose Ep (and be converted to other forms of energy)

   

• The equation for gravitational potential energy for energy changes in a uniform gravitational field is:

Gravitational potential energy (GPE): The energy an object has when lifted up

• The potential energy on the Earth’s surface at ground level is taken to be equal to 0
• This equation is only relevant for energy changes in a uniform gravitational field (such as near the Earth’s surface)

Derivation of GPE Equation

• When a heavy object is lifted, work is done since the object is provided with an upward force against the downward force of gravity
  • Therefore, energy is transferred to the object

   

• This equation can therefore be derived from the work done