Energy revision - science Flashcards
What is work?
Work is a measure of how much energy has been transferred when objects are moved or rearranged by a force.
How is work calculated?
Work (w) = force applied (F) x distance moved (d)
What is kinetic energy?
Kinetic energy is the energy possessed by moving objects.
How is kinetic energy calculated?
Kinetic energy (KE) = 1/2 x mass (m) x speed squared (v2)
What is gravitational potential energy?
The energy possessed by an object raised to a height in a gravitational field.
How do you calculate gravitational potential energy?
Gravitational potential energy (GPE) = mass (m) x gravity (g) x height (h)
What is an example of gravitational potential energy?
The energy you get when you jump on a trampoline (only when you are in the sky)
What is elastic potential energy?
The energy possessed by stretched or compressed objects. (Stored in elastic materials)
How is elastic potential energy calculated?
Elastic potential energy (EPE) = 1/2 x spring constant (k) x extension/compression squared (x2)
What is a spring constant?
A measure of how stiff an object is
What is the law of conservation of energy?
It states that energy cannot be created or destroyed therefore the total energy remains constant.
This means that energy is transformed into different formed.
How is energy efficiency calculated?
The amount of usable final energy / amount of initial energy X 100
