Gravitation

Question 1

Universal Law of Gravitation

[ State ]

Answer 1

Every object in the universe attracts every other object in the universe with a force that is directly propotional to the product of their masses and inversely propotional to the square of the distance between them.

Question 2

Value of G was found by…

Answer 2

Henry Cavendish

Question 3

Value of G

Answer 3

6.673 * 10 ^-11 Nm²Kg^-2

Question 4

Importance of the Universal Law of Gravitation

Answer 4

• The force that binds us to the earth
• The motion of the moon around the earth
• The motion of planets around the Sun
• The tides due to the moon and the Sun

Question 5

Weight

Answer 5

The gravitational force by which earth attracts an object is called weight of the object. It’s SI Unit is Newton.

• Weight = mass * gravity

Question 6

Thrust

Answer 6

The force acting perpendicular to an object is called thrust.

Question 7

Pressure

Answer 7

The force acting per unit area of an object is called pressure.

[ It is the thrust per unit area. ]

Question 8

Buoyant Force

Answer 8

The upward force exerted by the water on a immersed body is called as upthrust / buoyant force.

Question 9

Archimedes Principle

Answer 9

When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.