topic 1 Flashcards
What is a system
A single object or a group of objects that you are interested in
What happens when a system changes
Energy is transferred
How can energy be transferred when a system changes
- into or away from the system
- between different objects
- or between different types of energy stores
What are closed systems
Systems where neither matter nor energy can enter or leave
What is the net change in the total energy of a closed system
Always 0
4 ways energy can be transferred
- mechanically
- electrically
- by heating
- by radiation
What is work done
Energy transferred
How can work be done
When current flows or by a force moving an object
When is energy transferred to the kinetic energy store?
When an object speeds up and is transferred away from the store when an object slows down
What does the energy in the kinetic energy store depend on?
The objects mass and speed
The greater its mass and the faster its going … (kinetic energy)
The more energy they will be in its kinetic energy store
What does lifting an object in a gravitational field require?
Work
the higher the object is lifted … (GPE)
the more energy is transferred to this store
what does the amount of energy in a GPE store depend on
the object’s mass, its height and the strength of the gravitational field the object is in
what happens to energy when an object falls
energy from its gpe store is transferred to its kinetic energy store
