To calculate the efficiency of a toaster, divide the useful energy output (toast) by the energy input (electricity) and multiply by 100 to express the result as a percentage.
A student uses a pulley to lift a log. In 1-2 explain how she can calculate the pulley’s efficiency
To calculate the pulley's efficiency, the student can divide the work output (weight of the log lifted) by the work input (force applied by the student) and multiply by 100 to express the result as a percentage.
What is a efficent simple machine
An example of an efficient simple machine is the lever, which is capable of providing mechanical advantage and reducing the amount of force needed to accomplish a task.
