Isolated Systems. For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.That is, the momentum lost by object 1 is equal to the momentum gained by object 2. force that originates from a source other than the two objects of the system a force that is not balanced by other forces. A system in which the only forces that contribute to the momentum change of an individual object are the forces acting between the objects themselves can be considered an isolated system.
Definition of 'Beta' Definition: Beta is a numeric value that measures the fluctuations of a stock to changes in the overall stock market. Description: Beta measures the responsiveness of a stock's price to changes in the overall stock market.
Conversely, a beta of 0.85 indicates that the fund's excess return is expected to perform 15% worse than the market's excess return during up markets and 15% better during down markets. Beta can be a useful tool when at least some of a fund's performance history can be explained by the market as a whole. Beta is particularly appropriate when used to measure the risk of a combined portfolio of mutual funds. It is important to note that a low beta for a fund does not necessarily imply that the fund has a low level of volatility. A low beta signifies only that the fund's market-related risk is low.