18.1 + 18.2 Gravitational Fields, Newton's Law of Gravitation

Question 1

what are the charactertics of fields in general?

Answer 1

• the greater the field line density, the stronger the field
• fields are vectors (state the direction of force)
• field lines neevr cross but chnage pattern
• fields are uniform (constant strength) or radial (strength changes with displacement)

Question 2

what is gravitational field strength?

Answer 2

the force per unit mass

for planers g depends on mass and radius

Question 3

what are the assumptions of the gracitational force between two bodies?

Answer 3

• attractive force
• proportional to the mass of both bodies (M1,M2)
• inversley proprotional to distance between the bodies squared

Question 4

state Newton’s Law of Gravitation

Answer 4

the gravitational force of attraction between two bodies is directly proportional to the product of the masses of the bodies and invrsley proprtional to the square of the distance between th centres of mass of the two bodies

Question 5

state the equation from newton’s Law of Gravitation

Answer 5

Question 6

How would you find the resultant force acting on a body subject to gravitational forces from multiple bodies?

single plane

Answer 6

Question 7

How would you find the resultant force acting on a body subject to gravitational forces from multiple bodies?

two plane

Answer 7

Question 8

what is the gravitational field constant?

Question 9

Answer 9