elastic vs inelastic

inelastic collisions is when the object sticks together.
elastic collisions is when the object bounces off.
an elastic collision i saw in my daily life is  is a ball bouncing.
and an inelastic collision i saw in my daily life is a car crash
when the cars stick together

phase changes

i saw a ice cube melting it is a phase change
because it changes from solid to liquid.
its transition is called melting. heat energy
was added thats why it melted.

too hot too cold

metal is a conductor
light is radiation
plastic is a conductor
they heat up at different rates because their different materials