Chapter 13 : Gravitational Fields

Question 1

Gravitational Fields

Answer 1

A gravitational field is a region of space where a mass experiences a force.
Occurs due to the point mass.

Question 2

Centre Of Mass

Answer 2

Point on a body where the whole mass is concentrated.

Question 3

Uniform Gravitational Field ( g )

Answer 3

9.81 = g = F / m = GM / r2

Question 4

Radial Field

Answer 4

Where g is not the same.

Question 5

Field Line In Gravitational Field

Answer 5

Parallel

Question 6

Radial Gravitational Field

Answer 6

g depends on the position of the object on the surface.

Question 7

Universal Gravitational Constant ( G )

Answer 7

6.67 * 10^-11

Question 8

Universal Gravitational Constant ( G )

Answer 8

Every point mass attracts the other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Question 9

F is ( where r is distance or separation between 2 bodies )

Answer 9

GMm / r^2

Question 10

g in a radial field ( where M is the mass of the object )

Answer 10

GM / r^2

Question 11

Escape velocity v by solving GMm / r = 1/2mv^2

Answer 11

√ 2GM / r

Question 12

rw

Answer 12

√ GM / r

Question 13

2πr / T

Answer 13

√ GM / r

Question 14

Gravitational Potential ( Φ )

Answer 14

-GM / r

Question 15

Gravitational Field Strength

Answer 15

The gravitational field strength at a point is defined as the ( force per unit mass )
acting on a small mass placed at that point.

Question 16

Gravitational Field Lines

Answer 16

A gravitational field line is the direction of the gravitational force acting on a
point mass.

Question 17

Weight W

Answer 17

Mass * g

Question 18

Gravitational Potential

Answer 18

Gravitational potential at a point in a gravitational field is defined as the work
done per unit mass in bringing a small test mass from infinity to the point

Question 19

Gravitational Potential Energy

Answer 19

= mass × gravitational potential
= mΦ = −GMm/r
= Ep = −GMm/r