US military forces do a lot at home and abroad, but the different types of troops and the rules for each can be confusing.

Weight and mass Find out about the difference between weight and mass, how to explain why weight changes on different planets and how to apply the weight equation. Learn about the forces acting on ...

Balanced forces are responsible for unchanging motion. Balanced forces are forces where the effect of one force is cancelled out by another. A tug of war, where each team is pulling equally on the ...