Gravitation

Question 1

Newtons law of gravitation

Answer 1

Every object in the universe attracts every at the object and Is directly proportional to the product of mass and inversely proportional to the square of the distance between them.

Question 2

Definition of G

Answer 2

If two masses of one KG are at a distance of 1 m from each other than the force that exists between , the two masses is called gravitational constant

Question 3

Define g

Answer 3

Acceleration due to gravity is the increase in velocity, when objects accelerate as It falls freely due to gravitational attraction of the Earth

Question 4

g=

Answer 4

=GmM/R2

Question 5

Factors affecting acceleration due to gravity

Answer 5

1. The shape of the Earth
   p Earth is mulched at the equator, and is flat at the pool hence, acceleration, due to gravity, varies at the equator, and at the pole the acceleration due to gravity, is greater at the pole done at the equator

Question 6

Factors affecting acceleration due to gravity

Answer 6

1. The shape of the Earth
   Earth is buldged at the equator, and is flat at the pool hence, acceleration, due to gravity, varies at the equator, and at the pole the acceleration due to gravity, is greater at the pole done at the equator
2. Latitude
3. Altitude
   - g decreases with increase in height and
   - g decreases with increase in depth

Question 7

Why is the force of attraction or gravitational force at P zero?

Answer 7

According to the shell’s law, if a test mass is inside the shell, the gravitational force of attraction acting on it is zero.
P is a mass lying inside the earth at a depth d from. If a concentric circle is passing through P,, then the gravity force of attraction between the initial in the outer shell cancel out each other Heston net force of attraction become zero.

Question 8

Define gravitational field

Answer 8

It is the space around the body where the gravitational force can be experienced

Question 9

Intensity of gravitational field

Answer 9

It is the first experience to buy a unit mass at a point provided that the unit mass not disturb the original gravitational field

Question 10

Define gravitational potential

Answer 10

Gravitational potential at that point is the work done to move a unit mass from infinity to the point

Question 11

W=

Answer 11

-GMm/r

Question 12

V=

Answer 12

-GM/r

Question 13

U=

Answer 13

-GMM/r

Question 14

What are the 3 Kepler laws

Answer 14

1. Law of ellipse.
2. Law of equal areas
3. Law of harmony (/time period)

Question 15

State law of ellipse

Answer 15

Each planet revolves around the sun in elliptical orbit with the sun at one focus of the elliptical path

Question 16

State law of equal area

Answer 16

a line joining from any planet to the sun covers equal areas at equal intervals of time

Question 17

State law of time period

Answer 17

The square of the period of any planet about the sun is directly proportional to the cube of the semi major axis of the elliptical orbit

Question 18

Define ellipse

Answer 18

An ellipse is a special curve in which the sum of the distance from every point on the curve to two other points is a constant