48 Answered Questions for the topic Gravity

Gravity Physics

20d

Determining horizontal distance travelled

On Jupiter’s largest moon, gravity is 1.4 m/s2. An astronaut, standing on the edge of a 100m high cliff, hits a golf ball, sending it flying at 75 m/s [30° above the horizontal]. Determine the... more

03/22/21

PHYSICS HELP! Force of Gravitational Attraction

Determine the force of gravitational attraction between the earth ( which is 5.98 x 10^24 kg ) and a 70 kg physics student if the student is standing at sea level, a distance of 6.40 x 10^6 meters... more

09/18/19

Is it possible for two black holes to collide perfectly?

If two blackholes with exactly the same mass, are traversing the universe on a perfect collision course with no other gravitational force effecting either black hole, what would happen to both... more

08/03/19

Why shouldn't gravity be a force?

Why shouldn't gravity be a force? I am interested to know the reasons why we shouldn't treat gravity as a force in, for example, General Relativity. Won't we be able to model it accurately by... more

08/03/19

What physical forces pull/press water upwards in vegetation?

Each spring enormous amounts of water rise up in trees and other vegetation. What causes this stream upwards? Edit: I was under the impression that capillary action is a key factor: the original... more

08/02/19

When a ball is tossed straight up, does it experience momentary equilibrium at top of its path?

This question has been asked many times all over the Internet and answers can be found on places such as yahoo and ask.com, but I'm not satisfied with those answers and I don't trust the validity... more
Gravity Physics Forces Water

07/30/19

Sandstone getting soaked with water?

I have seen someone putting a sandstone in water. With only about 10% of the stone sitting in the water. One could see the stone getting soaked with water. So there must be a force, which lets the... more

07/17/19

Does the mass of a star change as it collapses into a black hole?

I know (I think!) that when a really big star collapses on itself it creates a black hole. My question: When a star collapses, is the mass equal to the mass of the star when it's not a black hole?... more

06/25/19

Planet orbits: what's the difference between gravity and centripetal force?

My physics teacher says that centripetal force is caused by gravity. I'm not entirely sure how this works? How can force cause another in space (ie where there's nothing). My astronomy teacher... more
Gravity Physics Forces

06/25/19

Origin of the force of gravity?

Where does exactly gravity come from when bodies exert this force? Does it come from the center of every object or it arises from their surface?

05/06/19

GR and my journey to the centre of the Earth?

>> [General Relativity] basically says that the reason you are sticking to the floor right now is that the shortest distance between today and tomorrow is through the center of the... more

05/06/19

Short of collision, can gravity itself kill you?

Imagine that you are falling into object with huge gravity (i.e. black hole) that does not have any atmosphere. The question is - before you hit the ground, can the gravity itself (which would be... more

04/17/19

How exactly does curved space-time describe the force of gravity?

I understand that people explain (in layman's terms at least) that the presence of mass "warps" space-time geometry, and this causes gravity. I have also of course heard the analogy of a blanket or... more

04/12/19

Am I attracting Pluto?

My question is simple: as the title says, **am I exerting a force over for example Pluto**, although it is a **very small** force, it is there, right? Or maybe let's go further: **Am I exerting a... more

04/12/19

Does gravity differ from place to place on Earth?

Does a particular object have the same weight on every part of Earth or does it vary?

04/12/19

If gravity isn't a force, then why do we learn in school that it is?

I have studied some of Einstein's Theory of General Relativity, and I understand that it states that gravity isn't a force but rather the effects of objects curving space-time. If this is true,... more
Gravity Math Algebra 2

04/04/19

Gravitational Force

The gravitational force, F, between an object and the earth is inversely proportional to the square of the distance from the object and the center of the earth. If an astronaut weighs 213 pounds on... more

03/16/19

Why is the Moon considered the major cause of tides, even though it is weaker than the Sun?

You have likely read in books that tides are mainly caused by the Moon. When the Moon is high in the sky, it *pulls* the water on the Earth upward and a high-tide happens. There is some similar... more
Gravity

08/02/18

05/07/18

A planet is orbiting a star when the star’s gravity suddenly vanishes. The planet thenheads outward along a straight line. Is Kepler’s second law still obeyed?

A planet is orbiting a star when the star’s gravity suddenly vanishes. The planet then obeys Newton’s First law and heads outward along a straight line. Is Kepler’s second law still obeyed? That is... more

The amount of gravitational potential energy of a Rocket (4U Physics)

2. A 222 kg weather rocket reaches its maximum height 32 km above the Earth's surface. Determine:a)The amount of gravitational potential energy at its maximum height.b) Its speed when it hits the... more
Gravity Physics Magnitude

04/18/18

Planet X has three....

Planet X has three Earth's mass and twice times Earth's radius. The magnitude of the gravitational field near Planet X's surface is most nearly...  a. 2 m/s^2  b. 7 m/s^2  c. 10m/s^2  d. 20... more

04/17/18

Finding mass of a star in orbit around a mass

In a certain binary star system, the masses of the two stars are equal. They revolve in a circular orbit around a center of mass midway between them. The orbital speed of each star is 2.8 x 10^5... more

04/10/18

Concept questions for gravity

Using the force of gravity, centripetal force, and normal force; why does an astronaut on a space station appear to be weightless?

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