when is an object said to be at rest give an example
Rest (physics)
In physics , rest is the state of an object being stationary relative to a particular frame of reference or another object ; when the position of a body with respect to its surroundings does not change with time it is said to be `` at rest '' . According to the theory of relativity , it is said that an object is `` at rest relative to '' another . For example , a train decelerates approaching a station and eventually comes to rest alongside the platform . The train can be said to be `` at rest with respect to the station '' , or , as the correct frame of reference is usually implicit and / or provided by context , simply `` at rest '' . In reality , there is nothing at absolute rest . For example , Earth 's gravitation constantly pulls objects toward its surface , while Earth is one of the objects the Sun constantly pulls towards itself , causing it to orbit the Sun ; the Sun , in turn , orbits the center of the Milky Way ; and so on . 
In physics , rest is the state of an object being stationary relative to a particular frame of reference or another object ; when the position of a body with respect to its surroundings does not change with time it is said to be `` at rest '' . According to the theory of relativity , it is said that an object is `` at rest relative to '' another . For example , a train decelerates approaching a station and eventually comes to rest alongside the platform . The train can be said to be `` at rest with respect to the station '' , or , as the correct frame of reference is usually implicit and / or provided by context , simply `` at rest '' . In reality , there is nothing at absolute rest . For example , Earth 's gravitation constantly pulls objects toward its surface , while Earth is one of the objects the Sun constantly pulls towards itself , causing it to orbit the Sun ; the Sun , in turn , orbits the center of the Milky Way ; and so on .
In physics , rest is the state of an object being stationary relative to a particular frame of reference or another object ; when the position of a body with respect to its surroundings does not change with time it is said to be `` at rest '' .For example , a train decelerates approaching a station and eventually comes to rest alongside the platform . The train can be said to be `` at rest with respect to the station '' , or , as the correct frame of reference is usually implicit and / or provided by context , simply `` at rest '' .
In physics , rest is the state of an object being stationary relative to a particular frame of reference or another object ; when the position of a body with respect to its surroundings does not change with time it is said to be `` at rest '' . For example , a train decelerates approaching a station and eventually comes to rest alongside the platform . The train can be said to be `` at rest with respect to the station '' , or , as the correct frame of reference is usually implicit and / or provided by context , simply `` at rest '' .