Learn what potential energy is and how to calculate the potential energy of gravity and also that of a spring.
Gravitational potential energy
Spring potential energy
A 2 kg block of wood is suspended 5m above a spring of spring constant 3000 N/m. When the block is dropped on the spring, how far will the spring be compressed from it's equilibrium position.
Time for Practice
- If you lift a 30 kg weight 0.5 meters, how much Potential energy has it gained?
- A spring has a spring constant k equal to 200 N/m. If it is stretched 0.4 m, what is its potential energy?
- A 12 kg box is resting on a table 1.5 m off the ground. It is then lifted up to 3.2 m off the ground. What is its increase in potential energy?
(using g = 10 m/s 2 )
- 150 J
- 16 J
- 204 J