LEARNING OBJECTIVE : 3.5.A Power is the rate at which energy changes with respect to time, either by transfer into or out of a system or by conversion from one type to another within a system. We introduced the meaning and basic definition of power in the last section. In this section we will build on the basic definition and arrive at different equations to express and calculate power. Average...
What is Power
LEARNING OBJECTIVE : 3.9.A - Describe the transfer of energy into, out of, or within a system in terms of Power The time element is not involved in the definition of work. The same amount of work is done in raising a given weight through a given height whether the work is done in one second, or one hour, or one year. Suppose we need to tidy up our lawn. We can use any of the three mowing machines...
Understanding Work
LEARNING OBJECTIVE 3.2.A - Describe the work done on an object or system by a given force or collection of forces. So far we have handled mechanics problems using force and Newton’s law. Now it’s time to switch to another method of analysing mechanics problems, namely the work and energy method. This method is often easier to use and can provide quick and neat solutions to mechanics problems if...