#### Using Force and Velocity

Let's say a braking car exerts a force of 100 Newtons at a velocity of 1 m/s. What is the power exerted by this stopping car?

With this problem, we simply plug the force and the velocity given into the equation for power.

P = F * v

= 100 N * 1 m/s

**= 100 J/s = 100 Watts**

But, what if we were given the same problem with slightly different numbers and using the second formula for power?

#### Using Work and Time

Say that instead of force and velocity, we are given force, distance, and time? A car exerts a force of 100 Newtons over 10 seconds for a distance of 10 meters.

First, we need to calculate the work done using the given force (100 Newtons) and the distance traveled (10 meters).

Work = Force * Distance

= 100 Newtons * 10 meters

= 1000 Joules

Next, we divide the work done by the amount of time it took to do that work to get the power.

Power = Work / time

= 1000 Joules / 10 seconds

**= 100 J/s = 100 Watts**

This is just one example of how you will be expected to use the various formulas concerning energy, force, and work in order to calculate power.