As you sit in your chair and study for the physical science test (assuming that you study for the test) the force of gravity acts downward upon your body. The reaction force
to the force of Earth pulling you downward is

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.

Answermake them get very hot and over time wear them out;

Athermometer to measure the temperature of course