Physics 9th Class: Important Short Questions Chapter 05 (urdu/english Medium) By Sir Luqman Physics

Q4. Solve the following numerical questions.
Two identical balls of masses 1000kg each have distance of 50m between their centers. Find the gravitational force between the balls.
Two stars of masses 2×〖10〗^10 kg and 4×〖10〗^20 kg experience gravitational force of 1000N. Find the separation between the two stars?
Calculate the value of g at the height of 1500km above the surface of earth?
A geostationary satellite revolves around the earth in an orbit of the radius 42000km. Find the value of g and orbital speed at this height?
Value of g on earth surface is 9.8〖ms〗^(-2). What is the value of g on a planet whose mass is five times the mass of earth and its radius is twice the radius of earth? What is the weight of 130kg body on this planet?
Calculate orbital speed of satellite orbiting around the earth at the height of 6400km?

9th physics chapter 05
Gravitational field class 9 physics | matric mart 1 gravitational field ch 9 | sabaq in urdu hindi

GRAVITATIONAL FIELD
According to the Newton's law of gravitation, the
gravitational force between a body of mass m and the
Earth is given by
where Me
is the mass of the Earth and r is the
distance of the body from the centre of the Earth.
The weight of a body is due to the gravitational
force with which the Earth attracts a body. Gravitational
force is a non-contact force. For example, the velocity of
a body, thrown up, goes on decreasing while on return its
velocity goes on increasing. This is due to the
gravitational pull of the Earth acting on the body whether
the body is in contact with the Earth or not. Such a force is
called the field force. It is assumed that a gravitational
field exists all around the Earth. This field is directed
towards the center of the Earth as shown by arrows in
figure 5.3. The gravitational field becomes weaker and
weaker as we go farther and farther away from the Earth.
In the gravitational field of the Earth


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