3.5 Power

Describe the transfer of energy into, out of, or within a system in terms of power. TOPIC 4.1 Linear Momentum

• 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.
• Average power is the amount of energy being transferred or converted, divided by the time it took for that transfer or conversion to occur. Relevant equation:
• Because work is the change in energy of an object or system due to a force, average power is the total work done, divided by the time during which that work was done. Relevant equation: The instantaneous power delivered to an object by a force is given by the equation P dW dt inst = .
• The instantaneous power delivered to an object by the component of a constant force parallel to the object’s velocity can be described with the derived equation