390 Words2 Pages

Newton’s Law of Motion
Newton’s law of motion consists of three physical laws and explains the connection between a mass and a force acting upon it, and its motion in response to that force.
1. “Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it”
Newton’s first law of motion is essentially Galileo’s concept of inertia, and is moving object tends to stay in motion, with the same direction and speed.
For motion (or lack of motion) to change it requires an unbalanced force acting on it. If you're going in a specific direction, you will always go in that direction unless something happens to you.
2. “The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.”
The second law shows that if you apply the same amount of force on two objects which have different masses, you will get different accelerations. The bigger the mass of an object, the less effect the force applied has on it. The effect of a 1kN force on a football would be much greater than on a bowling ball. The difference in acceleration is due to the difference in their masses.
The Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation:
or
FORCE = MASS X ACCELERATION
3. “For every action there is an equal and opposite reaction.”
This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
The rocket's action is to

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