Mechanics

What is Newton’s first law

Newton’s first law states that every body will continue in its state of uniform motion unless acted upon by an external, unbalanced net force

What is Newton’s second law

The constant acceleration of a body is proportional to the net force applied, and in the direction of that force, and is inversely proportional to the mass of the body.

What is newton’s third law

For every action force from one body onto a second body, there exists an equal and opposite reaction force from the second body onto the first.

Why can’t an astronaut use a regular scale.

Astronauts cannot use regular scales in space because regular scales rely on the normal force of the measured body, and in outer space, all bodys are in continuous free fall and do not have any normal force.