Physics

TRUEFriction is the reason more force is needed to push an object across a rough surface.

isotopes

The modern periodic table arranges elements based on properties. These properties include valence electrons of the elements and density for example.

Abstract classes are to be extended until to a concrete class.

Can have both abstract & non abstract methods.

An Abstract class can not be instantiated.

A non abstract class can be extended to an abstract class.

If At least one abstract method present in a class then that class must be abstract.

abstract & final modifiers can never be together.

abstract classes can have both abstract methods & non abstract methods.

Mathematical Figures Are Universal &&;nd Can Be Understood By Other Scientists

Thay collect data with a graph

experimentation or observation

:)

measurements should be made precisely to ensure accuracy (:

Resistance from air.

The first shell can hold up to two electrons, second up to eight electrons, third up to 18 electrons and the subsequent shells can have up to 32 electrons in each.

True

he was an old man in the 70's he had no life