Newton's 3rd law states that for every action, there is an equal and opposite reaction. This means that when an object exerts a force on another object, the second object will exert an equal and opposite force back on the first object.
Newton's 3rd law affects motion by explaining how objects move in response to forces. When an object exerts a force on another object, the second object will experience an equal and opposite force, causing it to accelerate in the opposite direction. This allows for the conservation of momentum in a system.
One example of Newton's 3rd law is the recoil of a gun. When a bullet is fired from a gun, the bullet exerts a force on the gun in one direction, causing the gun to exert an equal and opposite force on the bullet in the opposite direction. This is what propels the bullet forward.
No, Newton's 3rd law applies to all types of forces, including non-physical forces such as gravity. For example, the force of gravity from the Earth pulling on an object is equal and opposite to the force of the object pulling on the Earth.
Newton's 3rd law can be seen in everyday life in many scenarios, such as walking, pushing a door, or riding a bike. When walking, you push against the ground with your feet, and the ground pushes back with an equal and opposite force, propelling you forward. When pushing a door, you exert a force on the door, and the door exerts an equal and opposite force on you, allowing you to open the door. And when riding a bike, your feet push against the pedals, and the pedals push back, causing the wheels to turn and propel you forward.