gravitational and electric fields

Question 1

newton’s law of universal gravitation

Answer 1

• every particle in the universe is attracted to every other particle in the universe by a force directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres

Question 2

weight

Answer 2

• Fg

- the gravitational force the Earth exerts on any object on or near its surface

Question 3

gravitational field

Answer 3

• the force acting per unit mass

Question 4

coulomb’s law

Answer 4

• the force between two charges is directly proportional to the product of the charges and inversely proportional to the distance between their centres squared
• two point charges in free space or air exert forces on each other. The force is directly proportional to the product of their charges and inversely proportional to the square of the distance between the charges

Question 5

magnitude of the electric field at a point

Answer 5

• the force per unit positive charge

Question 6

mass vs. weight

Answer 6

mass

• kg
• scalar
• amount of object
• constant throughout the universe

weight

• N
• vector quantity
• force acting on object
• varies depending on position

Question 7

conservation of charge

Answer 7

• charge is neither created nor destroyed only transferred from one object to another