By Carroll B.W., Ostlie D.A.
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Additional info for An introduction to modern astrophysics
Matter occupies space and can be solid, liquid or gaseous. Unless matter is added to or removed from a body, the mass of that body never varies. It is constant under all conditions. There are as many atoms in a kilogram of, say, metal on the moon as there are in the same kilogram of metal on planet Earth. 4). The basic unit of mass is the kilogram (kg). 001 kg). 2 Force To understand how mass and weight are related it is necessary to consider the concept of force. A force or a system of forces cannot be seen; only the effect of a force or a system of forces can be seen.
To represent a force by a vector the following information is required: ● ● ● ● The point of application of the force. The magnitude (size) of the force. The line of action of the force. The direction in which the force is acting. The direction in which the force is acting is shown by the arrowhead. This can be at the end of the vector or at the midpoint of the vector, whichever is the more convenient. 81 N due to the gravitational attraction of planet Earth. Since planet Earth is not a perfect sphere a mass of 1 kg will weigh slightly more at the poles and slightly less at the equator.
2 Force To understand how mass and weight are related it is necessary to consider the concept of force. A force or a system of forces cannot be seen; only the effect of a force or a system of forces can be seen. That is: ● ● ● A force can change or try to change the shape of an object. A force can move or try to move a body that is at rest. If the magnitude of the force is sufficiently great it will cause the body to move in the direction of the application of the force. If the force is of insufficient magnitude to overcome the resistance to movement it will still try to move the body, albeit unsuccessfully.
An introduction to modern astrophysics by Carroll B.W., Ostlie D.A.