Have you ever wondered that how are we able to stand on the earth without falling into the center of the earth? Don’t know the answer. Don’t worry. We will find the answer in this video.
Certain forces around us keep us balanced or unbalanced. On earth many forces act on an object, one of them is a gravitational force that pulls all the objects to the center of the earth. However, there is another force exerted by the ground that pushes us upward. This is called a normal force. These two forces are equal and opposite in magnitude therefore the resultant force is zero. So the reason that we don’t fall to the center of the earth is that the force of gravity is balanced by the normal force.
The cute illustrations will help students learn this concept better.
This video satisfies the 3-PS2-1 requirement for third-grade science proficiency.
Students who demonstrate understanding can:
3-PS2-1. Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object.