1.
the tendency of an object to resist changes in its state of motion, including changes to its speed or direction
4.
"Solar power" or "power tools" (energy sources).
6.
Lighting homes and powering electronics.
7.
to force away, drive back, or hold off something
8.
to draw something toward oneself
9.
an invisible vector field surrounding magnets, electric currents, or changing electric fields that exerts magnetic forces on moving charges, iron, and other magnetic materials
10.
invisible force of attraction between all objects with mass or energy, pulling them toward each other
11.
or materials sliding or rubbing against each other
12.
frictional force that opposes the motion of objects traveling through the air
13.
mechanical, longitudinal pressure waves created by vibrating objects that travel through elastic medium
14.
vibrations generated by earthquakes, explosions, or volcanic eruptions that travel through the Earth’s interior or along its surface
15.
a type of electromagnetic radiation with the longest wavelengths and lowest frequencies in the electromagnetic spectrum
