Energy - Topic 1 Flashcards
Name the 7 stores of energy.
Energy Stores and systems
Gravitational potential Nuclear Kinetic Thermal Elastic Magnetic Chemical
What are the units of energy?
Energy Stores and systems
Joules, J
The law of conservation of energy states that:
Energy Stores and systems
Energy cannot be created or destroyed, only shifted between stores. The total amount of energy is always the same.
What does it mean when we say that energy is “dissipated”?
Energy Stores and systems
That energy has spread out, usually to the thermal store of the surroundings
What is a system?
Energy Stores and systems
An object or a group of objects.
Describe what is meant by an open system.
Energy Stores and systems
· External forces act
· Energy is dissipated
Describe what is meant by a closed system.
Energy Stores and systems
· No external forces act
· No energy is dissipated
How many Joules are there in 1 kJ?
Energy Stores and systems
1 kJ = 1000 J
How many Joules are there in 1 MJ?
Energy Stores and systems
1 MJ = 1 000 000 J
State which stores of energy change when a ball is thrown upwards.
Energy Stores and systems
- Gravitational store increases
- Kinetic store decreases
State which stores of energy change when a piece of coal is burnt.
Energy Stores and systems
- Chemical store of coal decreases
- Thermal store increases
State which stores of energy change when a car uses its brakes to slow down.
Energy Stores and systems
- Kinetic store decreases
- Thermal store of brakes increases
State which stores of energy change when you drop an object that doesn’t bounce.
Energy Stores and systems
- Kinetic store decreases during impact with floor
- Thermal store of ball and floor increase
State which stores of energy change when a car accelerates with a constant force.
Energy Stores and systems
- Chemical store of fuel or battery decreases
- Kinetic store of car increases
Holding two magnets with their opposite poles near to each other and releasing them.
Energy Stores and systems
- Magnetic store of the magnets decreases
- Kinetic store of the magnets increases
