Laws of Motion Explainer

Newton's First Law states that objects at rest tend to stay at rest.An object will only start moving when an external force is applied to it.Once in motion, objects tend to stay in motion, maintaining their velocity.Let's see how inertia affects passengers in a moving car. When a car suddenly stops, passengers tend to continue moving forward.In space, where there are minimal external forces, objects continue moving indefinitely in the same direction.Inertia is the natural resistance of objects to changes in their motion. The more massive an object, the more it resists changes to its motion.This resistance to change in motion, whether from rest or constant motion, is what we call inertia - a fundamental property of all matter.Newton's Second Law establishes the relationship between force, mass, and acceleration.The equation F equals m a tells us that force equals mass times acceleration.To understand this relationship, let's compare how the same force affects objects of different masses.When we apply the same force to both carts, the lighter cart accelerates more than the heavier cart.Now let's see how different forces affect the same object.A small force causes a small acceleration.While a larger force causes greater acceleration on the same mass.Newton's Third Law states that for every action force, there is an equal and opposite reaction force.When you push against a wall, the wall pushes back with exactly the same force. Let's measure this interaction.This same principle enables rockets to work in space. As the rocket expels gas in one direction, it experiences an equal force pushing it in the opposite direction.Birds fly using the same principle. Their wings push air downward, and the air pushes back upward with equal force.Swimming demonstrates this law perfectly. As swimmers push water backward, the water pushes them forward with equal force.