Space Walk, Newton Laws of Motion

When we see videos from NASA astronauts out in space in their aircraft, we see a clear sign of an environment without gravity. Imagining that I have signed up for a mission to the International Space Station to remove faulty station component and replace them, I would have to take a couple of precautions to take during my operation. Doing work the same work at the international space station would be entirely different than doing it on earth. Everyone else on this planet is bounded to obey the rules of gravity but not up in outer space.

Working at the International Space Station

Newton’s First Law of Motion

In the international space station, the first thing that you might recognize is that you would be floating in midair. The force of gravity that would be acting upon an object on earth would be 9.81 m/s2, and the international space station would be nearly zero. There would be no force acting upon an object and things would float in midair. “Newton’s first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. ” (National Aeronautics and Space Administration, 2017) According to Newton’s first theory of motion, an object would not move without another external force would be acting upon it. Hence the object that would be floating would not fall since there would not be another external force acting upon the object. Which this makes the object to float.

Newton’s Second Law of Motion

Another thing that you may notice is that when an object is pushed, it will keep on moving forward without falling or moving away in another direction. The object would maintain its speed that it started and since there would be no gravitational force or any other force that would be interacting with the object, the object would proceed its course. “According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it.” (The Physics Classroom ,2017) As Newton’s second law of motion, once a force is applied to an object, the object would continue with that momentum without accelerating or decelerating. Once the force is reflected upon an object, the object would continue to proceed with the same speed until there would be an unbalanced force acting upon the object to change its motion.

Newton’s Third Law of Motion

Astronauts would not able to hold still on the ground on space. For them to move from one place to the other, astronauts would have to kick and push walls away to move forward. By pushing the walls way, the force applied to the wall would directly react back to the astronaut and push back. As Newton’s first two law of motion states the effect of inertia and behavior of net force, the third law covers the effect of forces on two objects when one object applies a force to object two. (Colorado State University-Global Campus. (2017) The Newton’s third law of motion states an important point that to every force interact with another object, the force would reflect back. For example, if an astronaut was to try to get on the space station from space and try to reach for any surface of the space station, the astronaut would always be pushed away from this effect. Any small touch would reflect directly back so getting back on the ship without hanging on to something would be impossible.


It is significantly impressive of how Isaac Newton was able to figure these fundamental materials that are somewhere that can be unseen and unreachable. Out in the space station, we can see a clear sign of an environment almost without gravity. As an astronaut working at a space station, there different precautions and warning next time visiting space. Everything on this planet is bounded to obey the rules of gravity but not up in outer space.


Colorado State University-Global Campus. (2017). Introduction to Physics with Lab, Module 3: Explaining

Newton’s Law of Motion. Greenwood Village, CO.

National Aeronautics and Space Administration. (2017) Newton’s Law of Motion. Retrieved from

The Physics Classroom. (2017) Newton’s Laws – Lesson 3 – Newton’s Second Law of Motion. Retrieved