Universal Law of Gravitation

Q.

What are the important characteristics of gravitational force?

Q.

What are the units of gravity in SI?

Q.

Find the gravitational force exerted by earth on moon if distance between them is $3.84\times {10}^{5}Km$.

Mass of earth is $6\times {10}^{24}Kg$

Mass of moon is $7.35\times {10}^{22}Kg$

Q.

The only mechanical quantity which has a negative dimension of mass is

1. Angular momentum

2. Torque

3. Coefficient of thermal conductivity

4. Gravitational constant

Q.

The force of Gravitation between two objects varies with the medium they are in.

1. True

2. False

Q.

All free falling bodies have the same acceleration.

1. same velocity

2. same acceleration

Q.

Which of the following is/are correct?

1. Gravitational force can also act in vacuum.

2. Gravitational force is independent of medium and it is the responsible for all the phenomena of nature like the moon around the Earth, the Earth around the Sun, our binding with the Earth etc.

3. Newton was unable to discover the cause of gravitational force.

4. All of these.

Q.

Why is Newtons law of gravitation known as Inverse Square law?

Q.

Who discovered Gravity?

Q. Which of the following is applicable for the Moon's motion around the Earth?

1. Newton's First Law of Motion
2. Centripetal Force
3. Uniform Motion
4. Newton's Third Law of Motion

Q.

What is the gravitational force on body of mass $150Kg$ lying on the surface of earth.

Mass of earth given is $6\times {10}^{24}Kg$. radius of earth is $6.4\times {10}^{6}m$.

Q.

Define gravitational force quantitatively.

If the masses of two bodies are $m$ and $M$, and the distance between them is $r$.

1. 

2. 

3. 

4. 

Q. Which of the following is Newton's law of gravitation?

1. $F=\frac{G{m}_1{m}_2}{r}$
2. $F=\frac{G{m}_1{m}_2}{r^2}$
3. $F=ma$
4. $\frac{G{m}_1{m}_2}{r^3}$

Q.

Calculate the force of gravitation between the sun and the earth if the average distance between them is $1.5\times {10}^{8}Km$, mass of the earth is $6\times {10}^{24}kg$, mass of the sun is $2\times {10}^{30}Kg$.

Q. The weight of a body of mass $6.0kg$ on moon is $10N$. If a boy of mass $30kg$ goes from earth to the moon surface, what will be his ​
$\left(a\right)$ mass, ​
$\left(b\right)$ weight?​