Conservation of energy Flashcards
What is gravitational potential energy
the energy object has due to height in gravitational energy
What is kinetic energy
the energy an object has due to its mass and speed
what is an energy system
an object or group of objects
what is a closed system
a system with no net change to total energy in that state
what does a closed system suggest
that energy remains constant but the types of energy stores may change
what is conservation of energy
energy cannot be created or destroyed it can only be transferred
what is shown at the end of the sankey diagram
what is shown at the bottom of sankey diagram
useful energy
wasted energy
tell me what happens when an object is thrown upwards in regards energy stores
- the person holding ball is a store of chemical energy
- when its thrown the chemical energy is converted to kinetic energy
- as height increases kinetic energy converted gravitational potential energy
tell me what happens when an object hits and obstacle
- chemical energy from fuel is converted to kinetic energy
- as it hits the wall speed decreases rapidly
therefore kinetic energy decreases - as a result kinetic energy converted to heat and sound
tell me what happens when an object is accelerated with a constant force
- its chemical energy store in the fuel is converted to kinetic energy as it accelerates
tell me what happens when a vehicle slows down
- when the car is moving it has kinetic energy
- when it decelerates the kinetic energy is converted to heat and sound due to friction
tell me what happens when you boil water using kettle
the electrical energy is used to increase temperature of the heating element and converted to heat energy ( to the thermal energy store of the water by heating)
how can mechanical processes become wasteful
when they cause a rise in temperature
