Force and Laws of Motion

🔰Force and Laws of Motion 🔰

✍️Introduction

➖If we apply a force on an object, it may change its position or/and shape as well.

➖Galileo Galilei and Isaac Newton explained a different approach to understand motion and applied force.

✍️First Law of Motion

➖According to Galileo an object moves with a constant speed when no force acts on them.

➖According to Newton’s First Law of Motion, “an object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force.”

➖The tendency of uninterrupted objects to stay at rest or to keep moving if in motion with the same velocity is known as inertia.

➖Newton’s first law of motion is also popular as the law of inertia.

➖Quantitatively, the inertia of an object is measured by its mass, as the heavier or bigger objects have greater inertia and lighter or smaller objects have lesser inertia.

✍️Second Law of Motion

➖The second law of motion states that “the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force.”

➖The momentum represented as "p" of an object is defined as the product of its mass represented as "m" and velocity represented as "v".

➖Likewise, Momentum m = Mass m × Velocity v.

➖Momentum possesses both the direction as well as magnitude.

➖The SI unit of momentum is represented as kilogram-meter per second (kg m s-1).

➖The second law of motion illustrates a method to measure the force, which is acting on an object as a product of its mass and acceleration.

✍️Third Law of Motion

➖The third law of motion states that – “to every action there is an equal and opposite reaction.”

➖It is important to remembered that the action and reaction always act on two different objects.

➖It is important to remember that action and reaction forces are always equal in magnitude, but these forces may not produce accelerations of equal magnitudes because each force acts on a different object, which may have a different mass.

✍️Conservation of Momentum

➖The conservation of momentum states that, in a given area, the amount of momentum remains constant.

➖The momentum is neither created nor destroyed; however, it can be changed through the action of forces described by Newton′s laws of motion.

➖The mass of an object multiplied by the velocity of the object is known as momentum.