P1 - Energy Flashcards
Name 4 energy stores
Kinetic
Thermal
Chemical
Magnetic
State the conservation of energy principle
Energy can be transferred usefully , stored or dissipated, but can never be created or destroyed
Describe the energy transfers that occur as a ball is dropped
The ball is accelerated by the constant force of gravity.
Energy is transferred mechanically from the ball’s gravitational potential energy store to its kinetic energy store.
If energy is transferred to an object’s kinetic energy store,what happens to it speeds?
Speeds up
What is the definition of the specific heat capacity of a material?
The amount of energy to raise the temperature of a material of 1kg by 1 degree
Define power. give 2 equation you could use to calculate power
Power is the energy transferred per second.
Power = Energy transferred / Time
Power = Work done / Time
How can you reduce unwanted energy transfers in a machine with moving parts?
Use lubricants eg . oil in a car engines reduces friction between all moving parts.
True or False ? A high thermal conductivity means there is a high rate of energy transfer.
True
What is the efficiency of an energy transfer ? Give the equation that relates efficiency to power.
Is a measure if the amount of energy that ends up in useful energy stores. Efficiency = Useful power output / Total power input
Name four renewable energy resources and four non - renewable resources.
renewable : solar , wind , bio-fules , wave
Non renewable : coal , oil , gas , nuclear
Give an example of how a renewable energy resource is used in everyday life.
vehicles can run off bio - fules
Give two ways in which the environment can be damaged when using fossil fuels.
burning coal and oil releases sulfur dioxide which makes acid rain.
Acid rain makes rivers acidic which kills plants and animals.
Explain why the UK is trying to use more renewable energy resources in the future.
it has a better effect on the environment.
