First Law
The first law says that an object at rest tends to stay at rest and that a object in motion tends to stay in motion with the same direction and speed. If am ball is on top of a table motionless, and that there are no external force acting on it, it will never move. However, when the ball is in pushed by an external force towards the north, and that no other force is acting on it, it will never stop and never change direction. In the real world, this ball would sooner or later be stopped by friction between the ball and the table.
Second Law
Isaac Newton's second law is that the acceleration of an object is affected by the object's mass and the magnitude of force exerted. Similarly, the force applied on to the object can be calculated using the mass and the acceleration of the object. The formula is F=ma while F is the force applied, m is the mass of the object and a is the acceleration of the object. If you exert a similar force on to two object with different mass, both objects will accelerate differently.
Third Law
The third law is that for every action, there is an equal and opposite force. Forces are always found in pairs. For example, when a person is sitting on a chair, the person is exerting a downward force on the chair while the chair is exerting an upward force to support the person. This theory can also be proven when a rocket takes off. The rocket pushes down on to the ground with an enormous force, and the ground pushes the rocket up into the sky with the same amount of force.
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