Laws of Motion -02- Free Body Diagram of A Sphere

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A point A on a sphere of weight w rests in contact with a smooth vertical wall and is supported by a string joining a point B on the sphere to a point C on the wall. Draw free body diagram of the sphere.

Transcript

00:00Hi guys, someone great once said, life is what you make of it.

00:06Make Monday morning the best of your day and work day.

00:11There is a term in dynamics of motion known as free body diagram.

00:15This time, we will talk about it.

00:20We see a solid ball hung on a rope attached to a wall.

00:24Well, we are asked to draw a free body diagram of this system.

00:30Let's go to the discussion sheet.

00:34A free body diagram or FBD consists of a diagrammatic representation of a single body

00:40or a subsystem of bodies isolated from its surroundings showing all the forces acting on it.

00:47This system consists of a single body, namely the ball.

00:51So we will identify what forces are acting on the ball.

00:57The ball is around the earth.

00:59The ball will get a gravitational force towards the center of the earth.

01:03We often write the gravitational force as W.

01:09The rope is in a tense condition.

01:11The molecules of the rope will pull the ball in accordance with the direction of the rope.

01:16This pull is known as the tension force of the rope, often symbolized as T.

01:23The ball does not penetrate the surface of the wall.

01:26It means the normal force acts in the direction normal to the contact surface.

01:31This force is often written as N.

01:36It seems that there are no other forces besides these three forces.

01:41This is the free body diagram of the ball.

01:46In the analysis of motion dynamics, we must draw the free body diagram correctly.

01:51Happy learning everyone!

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