2 KMK-SP015 : Revision by chapter : Gravitation

Which equation represents Newton's law of universal gravitation?

•  $F_g=\frac{Gm_1m_2}{r}$  

•  $F_g=\frac{Gm_1m_2}{r^2}$  

•  $F_g=\frac{m_1m_2}{Gr^2}$  

•  $F_g=\frac{Gm_1r^2}{m_2}$  

The gravitational force between two masses is

• always attractive

• zero when a third mass placed between them

• inversely proportional to their distance

• directly proportional to the sum of the two masses

Two factors effecting the magnitude of the force of gravity between 2 objects are...

• mass and distance 
• mass and matter
• distance and weight 
• weight and mass

The earth and the moon are attracted to each other by gravitational force. The earth attracts the moon with a force that is:

• More than that exerted by the moon

• Same as that exerted by the moon

• Less than that exerted by the moon

• Not related to that exerted by the moon

The gravitation force is inversely related to

• distance between masses

• product of magnitude of masses

• direction of masses

• square of distance between masses

The weight of body is due to force of gravitation between body and

• earth

• other bodies

• atmosphere

• water

The gravitational field is directed

• towards the earth

• away from earth

• has no direction

• in a specific direction making angle with earth

As distance increases, magnitude of gravitational field strength

• also increases

• decreases

• remains constant

• may increase or decrease

The Earth may be assumed to be spherical with mass M and radius R, with acceleration of free fall g at its surface. Which equation correctly shows the gravitational acceleration?

• g = GM / R²

• g = R² / G M

• g = R² M / G

• g = M / G R²

A field that will apply a force to an object with mass is called a

• gravitational field

• Newton's field

• angular rotation field

• force field