<P> Rest , in physics , refers to 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 '' . </P>
<P> Rest , in physics , refers to 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 '' . </P>
when can we say that an object is at rest
when can we say that an object is at rest
When the position of a body with respect to its surroundings does not change with time
When the position of a body with respect to its surroundings does not change with time