Physics, 14.07.2020 06:01 mat1413

When an apple falls towards the earth, the earth moves up to meet the apple. Is this true?If yes, why is the earth's motion not noticeable?

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Answer from: Robinlynn228

According to Newton's third law, action and reaction are equal and opposite.

There is a gravitational force of attraction that acts between then falling apple and the earth. The magnitude of acceleration imparted by this force determines which of the bodies (the apple or the earth) will have a larger magnitude of acceleration.

Given that the acceleration imparted on the apple and the earth by the gravitational force F is;

a = F/m

where m is the mass of the object.

We can easily see that the earth has a much larger mass than the apple hence the magnitude of acceleration imparted to the apple by this force is much larger the magnitude of acceleration imparted to the earth by the same force.

Hence, we can see the apple moving but not the earth.

For a definition of gravity see

link

Answer from: rvj0444073603

Yes, this is true.

-- While the apple is falling, the same gravitational force acts on both the apple and the Earth.

-- The mass of the apple is somewhere in the neighborhood of 1/4 kg.

-- The mass of the Earth is about 5.972 x 10²⁴ kg.

-- Since the Earth has roughly 2.389 x 10²⁶ times as much mass as the apple has, the apple has roughly 2.389 x 10²⁶ greater acceleration than the Earth has, and moves roughly 2.389 x 10²⁶ times as far down as the Earth moves up, before they smack together.

-- That's why you don't notice the Earth's motion.

-- Also, you're standing on the Earth, moving up with it, toward the apple. Maybe it would be different if you were sitting on the apple, riding it down to the ground, and you were able to notice the motion of the ground coming up to meet you at a speed that's 0.00000000000000000000000000419 of YOUR speed.

Answer from: Quest

jupiter

explanation:

it is so massive and has such a strong gravitational pull its likely prevented the formation of a planet between itself and mars in the asteroid belt

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Answer from: Quest

m₁v₁ + m₂v₂ = (m₁ + m₂)vmomentum is conserved.the left-hand side of the equation represents the momentum in the system before the collision.the right-hand side represents the momentum in the system after the collisionm₁ and v₁ represents the mass and the velocity of the physics blockm₂ and v₂ represents the mass and velocity of the ball of puttyv represents the final velocity of the combined mass.the question states the two masses stick together. they combined mass has its own velocity with the body mass the sum of the two objects' massestheir combined momentum is (m₁ + m₂)vto find the magitude of (m₁ + m₂)v, we need to add the vectors on the left-hand side of the equation: m₁v₁ + m₂v₂.note the diagram. i have positioned the vectors in accordance with their directions.the magnitude of the resultant can be calculated using the pythagorean theorem since this is a right triangle situation (north and west are perpendicular)|(m₁ + m₂)v| = √[ (m₁v₁)² + (m₂v₂)² ]|(m₁ + m₂)v| = √[ (1.5kg·8.0m/s)² + (0.40kg·20m/s)² ]|(m₁ + m₂)v| = 14.4 kg m/sfor two significant figures (assuming that 20m/s is two), this rounds to 14 kg m/s

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When an apple falls towards the earth, the earth moves up to meet the apple. Is this true?If yes, wh...

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