The acceleration of a car is determined by measuring the time it takes for the car to accelerate from 0 to 100 
. The more powerful the engine is, the more time the car needs to accelerate.
If we want to shorten the time of doing the work, we must do the work with more power.
Two machines worked for one hour. If the first machine did more work during this time than the second, then, the first machine worked with more power.
A machine that works at a higher power always does more work than one that works at a lower power.
If two locomotives pull wagons with the same amount of force, the locomotive with higher power will have a higher speed.
An elevator with more power can lift a heavier load.
with a power of 
. What is the traction force of the locomotive of the train?
exerts a force 
on an object. The object moves a distance 
during the time 
that the force acts. Which equation is used to calculate the time 
to carry the man between the two floors. The useful work done against gravity is 
. The useful power developed is 
. The lift takes 
to carry the same man between the same two floors. How much useful work against gravity is done by the lift, and how much useful power is developed by the lift?
