Science 10

The science of work and energy. W = Fd = Energy. If you are applying a force to an object over a distance you are doing work on that object. You are also transferring energy to that object.

Force (N) is equivalent to mass (Kg) times acceleration (m/s² ) . F = ma. Our units show that  1 Newton (N) is equivalent to 1 Kg m/s² 

Work is measured in N-m (Newton-Meter) or more specifically a Joule (J). Energy is also measured in Joules.

Gravitational Potential Energy  ( E_{p (grav)}  )  is the stored energy an object has by virtue of its position of above Earth's surface. Gravitational Potential Energy is a function of mass (m) times the accelerations due to gravity (g= 9.81 m/s² ) and height (h)

E_{p (grav)}  = mgh . Our units would be ...    J = Kg x m/s²  x m =  (N) m

Also,  Weight = mass (m) times the acceleration due to gravity(g) . (1 Kg m/s² ) = 1 Newton. Therefore, weight is a force.

This video talks a little bit more about Kinetic Energy (  E_k = 1/2mv² ) which we will talk about next week. He goes farther into the concept than I would expect from you at this stage. You should still check it out!