Gravitation

Question 1

Centripetal Force

Answer 1

The force acting on an object in curvilinear motion directed towards the axis of rotation / centre of curvature.

Question 2

Universal law of gravitation

Answer 2

Every object in the universe attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them

Question 3

Formula of universal gravitation constant

Answer 3

G = Fd²/ Mm

Question 4

Unit of Universal gravitation constant

Answer 4

Nm²/kg²

Question 5

Value of universal gravitation constant

Answer 5

6.673 x 10 -¹¹ Nm²/ kg²

Question 6

Who found the value of the universal gravitation constant

Answer 6

Henry Cavendish

Question 7

Define free fall

Answer 7

An object is said to be in freefall when it falls from a given height with the only force acting on it being gravity

Question 8

Value of acceleration due to gravity

Answer 8

On earth: 9.8 m/s²
On moon: 1.6 m/s²

Question 9

Formula of acceleration due to gravity

Answer 9

g = G M/d²

Question 10

Weight

Answer 10

Weight is a vector quantity that is the measure of force acting on an object due to acceleration due to gravity

Question 11

Mass

Answer 11

Mass is a scaler quantity that is the amount of matter in a given object

Question 12

Formula of weight

Answer 12

W = gm

Question 13

Thrust

Answer 13

A force acting perpendicularly on a surface.
SI unit Newton
CGS unit Dyne

Question 14

Pressure

Answer 14

Thrust acting per unit area .
SI unit Pascal= N/m²
CGS unit = D/cm²

Question 15

Pressure formula

Answer 15

P= T/A= F/A

Question 16

Buoyant force / upthrust

Answer 16

Perpendicular force applied on an object by a fluid.