Gravity

Question 1

Gravitational field strength def

Answer 1

The gravitational force excerted per unit mass on a small on a object places at that point within the field

Question 2

Gravitation field strength: vector or scalar

Answer 2

Vector, always points to the centre of mass of the object creating the field

Question 3

How is a gravitational field represented

Answer 3

As field lines going towards the centre of the object which is producing the field

Strong field: lines close together
Weak field: line’s further from each other

Question 4

Newtons law of gravity

Answer 4

The forces between two point masses is directly proportional to the product of their masses and inversely proportional to the square of their seperation

Question 5

How does the attractive force between objects change with the seperation

Answer 5

Decreases with an inverse square relationship (double the distance and the force between objects will decrease by a factor of 4)

Question 6

Relationship between gfs and mass

Answer 6

Directly proportional

Question 7

Relationship between gfs and distance

Answer 7

Gfs is inversely proportional to the distance squared

Question 8

Keplers first law

Answer 8

The orbit of a planet is elliptical with thr sun at one of the two foci

Question 9

Keplers second law

Answer 9

A line segment joining the sun to a planet sweeps out equal areas in equal time intervals

Question 10

Keplers third law

Answer 10

The square of the orbital time period T is directly proportional to the cube of the orbital radius r

Question 11

Gravitational potential

Answer 11

The work done per unit of mass in bringing a mass from infinity to a defined point