THE EFFICIENCY OF A MACHINE IS ALWAYS LESS THAN 100% BECAUSE THE

• A. work output is always greater than the work input
• B. load lifted is always greater than the effort applied
• C. effort applied is always greater than the load lifted ✓
• D. velocity ratio is always greater than the mechanical advantage

The answer to the question is: C. effort applied is always greater than the load lifted

The efficiency of a machine is always less than 100% because the effort applied is always greater than the load lifted. Efficiency in the context of machines refers to the ratio of useful work output to the total energy input. It is a measure of how well a machine converts input energy into useful output energy. The efficiency of a machine can be calculated using the formula:

Efficiency = (Useful work output / Total energy input) x 100%

In the case of machines, the work input is the effort applied, and the work output is the load lifted or the useful work done by the machine. The reason why the efficiency of a machine is always less than 100% is due to various factors such as friction, heat loss, and other inefficiencies in the conversion process. These factors result in some of the input energy being wasted and not contributing to the useful work output, thereby reducing the overall efficiency of the machine.

When considering mechanical systems, it is important to understand that no machine can be 100% efficient due to these inherent losses. Therefore, regardless of how well-designed a machine may be, there will always be some level of inefficiency resulting in an efficiency value less than 100%.