Topic 1 - Conservation and Dissipation of Energy Flashcards
What is the name given to energy stored in muscle tissue, batteries and cars?
Chemical Energy
What is kinetic energy?
Energy an object has when it is moving.
What is gravitational potential energy?
Energy stored in an object because of its position.
What is elastic potential energy?
Energy an object has when you squash it.
What is thermal energy?
Energy stored in an object because of its temperature.
What is a closed system of energy?
When no net change to energy stores occur.
What is the principle of conservation of energy?
Energy cannot be created nor destroyed, only transferred.
What is another name for transferring energy to an object?
Work done on the object.
What is the equation for Work Done?
Work Done (J) = Force (N) x Distance (m)
Work done to overcome friction transfers a lot of?
Thermal energy.
What is the equation for Gravitational Potential Energy?
Gravitational Potential Energy (J) = Mass (kg) x Gravitational Field Strength (N/kg) x height (m)
What is the equation for kinetic energy?
Kinetic Energy (J) = 0.5 x mass (kg) x velocity (m/s) squared
Hooke’s law is?
A law that some objects with elastic potential energy stores obey, where Force (needed to extend a spring in N) = spring constant (N/m) x extension (m)
What is the equation for elastic potential energy?
Elastic potential energy = 0.5 x spring constant (N/m) x extension (m) squared.
What is useful energy?
Energy transferred into the intended store for the reaction. E.g. a light bulb’s useful store is light.
