There's gravitational force between every two specks of mass in the universe.
That would include between every two people. Regardless of where they are.
The magnitude of the force between two 100-pound students sitting with their centers
20 feet apart is about 0.000000003695 Newton, or about 0.0000000133 ounce.
There is also gravitational force between the lint in the pockets of each student.
That force is much less, because the lint has so much lass mass.
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Yes, there is a gravitational force between any two objects with mass, including students. However, the force is extremely small due to the small masses of the students compared to the mass of the Earth.
Yes, there is gravitational force between the two students. However, the force is extremely weak compared to other forces acting on them. This is why we cannot visibly see the effect of gravity between them.
If the masses are halved, the gravitational force will also be halved. This is because the force of gravity is directly proportional to the product of the masses and inversely proportional to the square of the distance between them. So, if one of the masses is halved, the gravitational force between them will be reduced by half as well.
The force between a person and the chair they are sitting on in a classroom is the normal force. This force is exerted by the chair in the opposite direction of the force the person exerts on the chair due to gravity, preventing the person from falling through the chair.
The gravitational force acting on mass causes objects to be attracted towards each other. This force is responsible for keeping planets in orbit around the sun and objects on the Earth's surface.
If two students are exerting a force in the same direction to move a piano, you can determine the net force by simply adding their individual forces together. The net force is the sum of the forces exerted by both students.