Distinguish between active and passive transport

Passive transport does not require ATP energy to be spent by the cell; active transport involves the cell spending energy to move materials.

Molecules naturally move from areas where they are abundant (high concentration) to where they are less common (low concentration) in a process called diffusion. Some molecules will cross in or out of a cell membrane in this way without the cell having to spend any energy to do so. This is passive transport.

When the cell wants to build up an excess of molecules on one side of the cell membrane (inside or outside) it must spend energy to counteract the tendency towards diffusion (described above). The cell must spend energy to do this and this is referred to as active transport.

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy