The confusion on the concepts of mass and weight arises from the fact that the acceleration due to gravity is more or less constant in any place on the Earth’s surface, thus the weight of an object is directly proportional to its mass.

The inertia of an object is a measure of its resistance to a change in the state of its motion. It is solely dependent on the mass of the object, with more massive objects having larger inertia and a greater tendency to resist changes to their motion.

Inertia is proportional to mass. Big masses resist changing their motion more than smaller masses. Objects at rest remain at rest unless acted on by a net force. In fact, a large net force is required to change its speed or direction.

No, inertia does not depend on speed. Inertia solely depends on the mass. The more mass, the more inertia.

Inertia is a property of matter. According to Newton’s Law of Inertia, an object at rest tends to stay at rest unless acted upon by a force. The relationship between an object’s mass m, its acceleration a, and the applied or external force F is: F = ma.

Inertia is that quantity which depends solely upon mass. The more mass, the more inertia. Momentum is another quantity in Physics which depends on both mass and speed. Momentum will be discussed in a later unit.

This can be found using Newton’s second law — F = ma — which translates to, “Force equals inertial mass times acceleration.”

Because the force of gravity is an inertial force, we must first of all understand the other inertial forces existing in nature and, moreover, briefly examine what causes these forces, namely the two mechanical fundamental properties of mass; because the entire problem of space travel is based on these issues.

The ball “wanted” to continue in a straight line with constant speed. There was not a force that made it move to the right. Inertia made the basketball continue in a straight line and thus appear to move right as if some force moved it. That is why the centrifugal force is fictitious.

In general relativity, gravity is a fictitious force. In classical mechanics, fictitious forces are not considered “real” forces. If you believe that inertial forces are forces, then gravity is a force. If you believe that inertial forces are not forces, then gravity is not a force.

As a frame can accelerate in any arbitrary way, so can fictitious forces be as arbitrary (but only in direct response to the acceleration of the frame). Gravitational force would also be a fictitious force based upon a field model in which particles distort spacetime due to their mass, such as general relativity.

The forces you feel in a moving car—those that push you back into your seat when the driver steps on the gas or throw you side to side when the car makes sharp turns—are everyday examples of fictitious forces.

Fictitious forces arise because of the acceleration of the frame of reference itself. No real forces act on the object, still the object accelerates. So why it is said that if the earth were to rotate with more angular velocity we would fly off to the sky due to centrifugal force?

Answer: We don’t really know. We can define what it is as a field of influence, because we know how it operates in the universe. And some scientists think that it is made up of particles called gravitons which travel at the speed of light.

Gravity is strongest at the Earth’s surface, and its weakest at the Earth’s core.

The movement of every object — from a person to a supermassive black hole — produces gravitational waves. Most everyone in the scientific community believe gravitational waves exist, but no one has ever proved it.

Sir Isaac Newton

Einstein argued that gravity isn’t a force at all. He described it as a curvature of time and space caused by mass and energy. Their math, laid down in 10 equations, explained how gravity could move around objects via a warped reality, accelerating without ever feeling any mysterious Newtonian forces.

Earth’s gravity comes from all its mass. All its mass makes a combined gravitational pull on all the mass in your body. You exert the same gravitational force on Earth that it does on you. But because Earth is so much more massive than you, your force doesn’t really have an effect on our planet.

Without the force of gravity to hold it together, the intense pressures at its core would cause it to burst open in a titanic explosion. The same thing would happen to all the other stars in the Universe. Eventually there would be no clumps of matter, like stars or planets, anywhere in the Universe.

In the 20th century, Newton’s model was replaced by general relativity where gravity is not a force but the result of the geometry of spacetime. Under general relativity, anti-gravity is impossible except under contrived circumstances.

No. As you get farther away from a gravitational body such as the sun or the earth (i.e. as your distance r increases), its gravitational effect on you weakens but never goes completely away; at least according to Newton’s law of gravity. …

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planet’s volume.

2. Why is gravity so weird? No force is more familiar than gravity — it’s what keeps our feet on the ground, after all. And Einstein’s theory of general relativity gives a mathematical formulation for gravity, describing it as a “warping” of space.

They proposed that gravity is actually made of quantum particles, which they called “gravitons.” Anywhere there is gravity, there would be gravitons: on earth, in solar systems, and most importantly in the miniscule infant universe where quantum fluctuations of gravitons sprung up, bending pockets of this tiny space- …

Former ISRO chairman Madhavan Nair recently said that Aryabhata knew of gravitational force 1500 years before Newton. Other scholars disagree. A Vedic conference has stirred the pot of ancient Indian scientific achievement yet again. “Aryabhata did us credit but we can’t claim that he discovered gravity,” Rao added.