Forces Doing Work Flashcards
How can energy be transferred?
By one of the following four types of energy pathways
What are the 4 types of energy pathways?
Mechanical work
Electrical work
Heating
Radiation
What is mechanical work?
a force moving an object through a distance
What is electrical work?
charges moving due to a potential difference
What is heating?
due to temperature difference caused electrically or by chemical reaction
What is radiation?
energy transferred as a wave eg light, infrared, sound - the Sun emits light radiation and infrared radiation
What does doing work mean?
its the scientific way of saying that energy has been transferred
What happens when a toy car rolls to a stop?
Kinetic energy store decreases as energy is transferred into the thermal energy store of the surroundings by the work done by the force of friction.
What happens when an electric motor lifts a weight?
The chemical energy store decreases as energy is transferred via the electrical pathway and the gravitational potential energy store increases.
What are two examples of an energy flow diagram?
Transfer diagram
Sankey diagram
How does a transfer diagram work?
In transfer diagrams the boxes show the energy stores and the arrows show the energy transfers.
How do Sankey diagrams work?
Sankey diagrams start off as one arrow that splits into two or more points. This shows how all the energy in a system is transferred into different stores.
What happens when a force causes a body to move?
work is being done on the object by the force.
What is work the measure of?
Energy transfer
What does energy transferred equal?
Work done
