# Gravity

### Gravitational Field

A gravitational field as a region in which an object experiences a force due to gravitational attraction.

### Gravitational Field Strength

1. The gravitational field strength at a point in the gravitational field is the gravitational force acting on a mass of 1 kg placed at that point.
2. The unit of gravitational field strength is N/kg.
3. The gravitational field strength is denoted by the symbol "g". g = Gravitational Field Strength
F = Force acted on an object
m = mass of the object.

### Gravitational Acceleration

1. The gravitational acceleration is the acceleration of an object due to the pull of the gravitational force.
2. The unit of gravitational acceleration is ms-2
3. Gravitational acceleratio is also denoted by the symbol "g".

#### Important notes:

1. Gravitational acceleration does not depend on the mass of the moving object.
2. The magnitude of gravitational acceleration is taken to be 10ms-2.

#### Gravitational Field Strength vs. Gravitational Acceleration

1. Both the gravitational field strength and gravitational acceleration have the symbol, g and the same value (10ms-2) on the surface of the earth.
2. When considering a body falling freely, the g is the gravitational acceleration.
3. When considering objects at rest, g is the Earth’s gravitational field strength acting on it.

### Weight

1. The weight of an object is defined as the gravitational force acting on the object.
2. The SI unit of weight is Newton (N)

#### Differences between Weight and Mass

 Weight Mass Depends on the gravitational field strength Independent from the gravitational field strength Vector quantity Scalar Quantity Unit Newton (N) Unit: Kilogram (kg)