# General Knowledge about Newton’s Laws of Motion

First Law: Everybody maintains its initial state of rest or uniform motion on a straight line unless any external force acts on it. It is also called Galileo’s law of inertia.

Example: While jumping from a slowly moving train/bus one must run for a short distance, in the direction of motion.

Second Law The force acting on an object is directly proportional to the product of the mass of the object and the acceleration produced on it.

Third Law: To every action, there is an equal and opposite reaction.

Example: Bogies of the trains are provided with buffers to avoid severe jerks during shunting of trains.

Rocket moves up due to reaction of downward ejection of gas.

Circular Motion

• When an object moves along a circular path, its motion is called circular motion.
• The direction of motion at any point in circular motion is given by the tangent to the circle at that point
• The external force required to act radially inward over the circular motion of the body is called centripetal force.
• In the death well, the walls of well exert an inward force over the motorcycle and as a reaction, the motorcycle exert an outward force on the walls of the well.
• Centrifugal force is such a pseudo force that is equal and opposite to centripetal force.
• Cream separator, centrifugal dryer work on the principle of the principle of centrifugal force.
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