5.  If all objects have gravitational force between them, why wouldn't you feel the force of gravitation between your chair and your body?

While it's true that all objects exert a gravitational force on each other, the strength of this force is dependent on the mass of the objects and the distance between them. The formula for gravitational force is F = G * (m1*m2)/r^2, where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between the centers of the two objects.

The gravitational constant, G, is a very small number, approximately 6.674 * 10^-11 N(m/kg)^2. This means that the gravitational force between everyday objects, like your body and a chair, is extremely small.

For example, let's say your body has a mass of 70 kg and the chair has a mass of 10 kg. If the distance between the centers of your body and the chair is 1 meter, the gravitational force between them would be F = 6.674 * 10^-11 * (70*10)/1^2 = 4.6718 * 10^-9 N. This force is so small that you wouldn't be able to feel it.

In contrast, the Earth has a mass of approximately 5.972 * 10^24 kg. The gravitational force between your body and the Earth is F = 6.674 * 10^-11 * (70*5.972 * 10^24)/6371000^2 = 686.75 N. This is the weight of your body, and it's a force you can definitely feel.

So, while the chair does exert a gravitational force on your body, it's so small compared to the force exerted by the Earth that you don't notice it.