Unit 1
Who was Ptolemy?
Ptolemy was a Roman scientist. He lived in Egypt, which was a Roman colony at the time. Ptolemy studied astronomy, geography, and mathematics.
What is a force?
A force is a strength or energy acted upon an object to push or move it.
What is a magnet?
A magnet is an object that can attract or repel other magnets.
What is matter?
Matter is anything that has mass and volume.
(True or False) It is possible to see atoms with the naked eye
False! atoms are barely even able to be seen with a microscope they are so small!
When did Astronomy start in China?
Astronomy started early in China. In 400 BC, a book was written that described the passage of 29 comets.
(Truth or False)
Technically, the gravitational field of a person is also pulling the Earth.
Truth! The gravity of a person is also pulling the Earth.
What is the force called that is applied onto magnets?
A magnetic force
What is matter made up of?
Matter is made up of atoms and molecules.
What are the elements in Group 17 of the periodic table are called?
Halogens; This group is located in the column that is second from the right on the table. Halogens contain the elements fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
What was Isaac Newton's 3 laws?
Law 1: Every object in a state of uniform motion will remain in that state of motion unless an external force acts on it.
Law 2: Force equals mass times acceleration f(t) = m a(t)
Law 3: For every action there is an equal and opposite reaction.
What is the difference between contact forces and field forces?
A contact force is a force that acts through touch. Physical pushes and pulls are examples of contact forces.
What is a ferromagnetic metal?
A metal that a magnet can attract, such as iron, cobalt, or nickel
What are the four states of matter?
The four states of matter are observable in everyday life: solid, liquid, gas, and plasma.
What is the difference between elements and compounds?
Elements are made up of one type of molecule while compounds are made up of 2 or more different types of molecules.