P1 - 1.2 Energy Transfer Examples Flashcards
What is the conservation of energy law
Energy cannot be created or destroyed. It can only be transferred from one form to another
What is the law called where energy cannot be created or destroyed and only transferred from one form to another
Conservation of energy law
Scenario:
A fire burns fuel such as coal to produce heat
What is the energy store of the coal
Chemical energy
Scenario:
A fire burns fuel such as coal to produce heat
When the coal is burned how is energy transferred
Chemical energy in the coal is transferred by heating to the thermal energy store of the coal
Scenario:
A fire burns fuel such as coal to produce heat
How is energy transferred from the coal to the surroundings
Via heating and radiation
Scenario:
A driver slows a car from 15 m/s to rest
What is the energy store of the car
Kinetic energy
Scenario:
A driver slows a car from 15 m/s to rest
How does the brakes do work on the car
They brakes mechanically do work to slow the car down
Scenario:
A driver slows a car from 15 m/s to rest
How is energy transferred
The kinetic energy of the car decreases whilst the the thermal energy store of the brakes increases
Scenario:
An archer pulls the string of the bow back and loads an arrow. The archer then releases the string allowing the arrow to fire
How is energy transferred from the archer to the bow
As the string of the bow is pulled back chemical energy in the archers muscles is transferred mechanically to the elastic potential of the bow.
Scenario:
An archer pulls the string of the bow back and loads an arrow. The archer then releases the string allowing the arrow to fire
How is energy transferred from the bow to the arrow
When the archer releases the string of the bow, the elastic potential energy of the string is transferred mechanically to the kinetic energy store of the arrow.
How does energy transfer when a battery powered toy car travels across the floor?
Chemical —> kinetic
A toy car has a spring which stores elastic potential energy. When released, the toy car moves across the floor.
How does the energy transfer mechanism in the toy car?
Mechanically
