Issac Newton made three laws of motion that every particle in this universe obeys. The laws are:
First Law: “An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion will stay in motion unless acted upon by an unbalanced force.” This law is often known as the “lay of inertia” When learning this law, many people question it because, when you say, throw a baseball, it will eventually come to a stop. That is because gravity is an unbalanced force that acts upon it, causing drag which slows it down gradually until it comes to a stop. There is also air resistance that comes into play, causing additional drag if the object is moving through the air. In space, if you were to throw a baseball, it would go on forever until it was “grabbed” so to speak, by a planet or stars gravity, or ran into something else. Another problem some people have is that a round object will sometimes begin to roll, seemingly on it’s own. This means that the object is on a slight slope, and is being acted upon by gravity.
Second Law: “Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).” This means that the bigger the object, the harder it is to move, essentially. Everybody knows this law already, whether or not they know this to be a law. A small pebble is much easier to move then it is to move a boulder.
Third law: “For every action there is an equal and opposite reaction” Let’s use a rocket for an example of this law. the rocket burns fuel which causes fire to come out of the back. This action causes a reaction, the reaction being the rocket lifting off, or moving forwards through space. It doesn’t seem equal during liftoff because gravity and air resistance is causing drag on the rocket as it moves upwards.
Let’s review the 3 laws with the kicking of a soccer ball. The ball is resting until you kick it (Law 1) As you kick it, acceleration is applied and the ball moves forward easily, being small (Law 2). Law 3 may seem not to be in effect, but your leg is compelled to go backwards, but it has momentum and your muscle mass preventing your leg from going backwards.