Why does the density of a substance remain the same for different amounts of the substance

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied. true or false

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

The material that keeps its new shape after it is stretched is called?