# [Answer] What type of path does a moving object follow in the absence of a force?

###### Answer: It continues to move in a straight line at a constant speed.
What type of path does a moving object follow in the absence of a force?

The first law states that an object at rest will stay at rest and an object in motion will stay in motion unless acted on by a net external force .Mathematically this is equivalent to saying that if the net force on an object is zero then the velocity of the object is constant. ∑ = ⇔ = Newton’s first law is often referred to as the principle of inertia.

In the absence of other forces gravity results in a constant downward acceleration of every freely moving object. Near Earth’s surface the acceleration due to gravity is g = 9.8 m⋅s −2 and the gravitational force on an object of mass m is F g = mg. It is convenient to imagine this gravitational force concentrated at the center of mass of the object

All of the known forces of the universe are classified into four fundamental interactions. The strong and the weak forces act only at very short distances and are responsible for the interactions between subatomic particles including nucleons and compound nuclei. The electromagnetic force acts between electric charges and the gravitational force acts between masses. All other forces in nature derive from these four fundamental interactions. For example friction is a manifestation of the electromagnetic force acting between atoms of two surfaces and the Pauli exclusion principle

All of the known forces of the universe are classified into four fundamental interactions. The strong and the weak forces act only at very short distances and are responsible for the interactions between subatomic particles including nucleons and compound nuclei. The electromagnetic force acts between electric charges and the gravitational force acts between masses. All other forces in nature derive from these four fundamental interactions. For example friction is a manifestation of the electromagnetic force acting between atoms of two surfaces and the Pauli exclusion principle which does not permit atoms to pass through each other. Similarly the forces in springs modeled by Hooke’s law are the result of electromagnetic forces and the Pauli exclusion principle acting together to return an object to its equilibrium position. Centrifugal forces are acceleration forces that arise simply from the acceleration of rotating frames of reference. The fundamental theories for forces developed from the unification of different ideas. For example Sir Isaac Newton unified with his universal theory of gravitation the force responsible for objects falling near the surface of the Earth with the force responsible for the falling of celestial bodies about the Earth (the Moon) and around the Sun (the planets). Michael Faraday and James Clerk Maxwell demonstrated that electric and magnetic forces were unified through a theory of electromagnetism. In the 20th century the development of quantum mechanics led to a modern understanding that the first three fundamental forces (all except gravity) are manifesta…