Uniform gravitational force
The gravitational force acting on a mass is called weight. Weight always acts vertically down and its magnitude is directly proportional to the mass.
where g is the gravitational field strength on the Earth’s surface. Gravitational field strength of a point is the gravitational force acting on a unit mass at that point.
The SI unit of gravitational field strength is .
On the Earth’s surface, the gravitational field is uniform and its direction is vertically down. A uniform field is represented by parallel field lines. A mass placed anywhere in a uniform field experiences the same gravitational force.
The direction of the gravitational field indicates the direction of the force acting on a mass placed in the field.
When a mass is thrown vertically upward, its initial velocity is v. At its maximum height, its velocity is . It then falls and its velocity reaches v in the downward direction.
What are the values of acceleration at point A, B and C?