Work/Power
a transfer of energy through motion; the ability to cause a change/.
Work
The energy that is possessed by an object due to its motion or due to its position.
Mechanical Energy
= mgh
Gravitational Potential Energy
unit of energy, work, or heat
Joule
Kinetic Energy change resulting from decreasing the mass of the object in motion by half
1/2 original KE
How quickly work is done; the time it takes to do work.
Power
a property of objects that can be transferred from one object to another; can be converted to different forms, but cannot be destroyed.
Energy
= ½ mv2
Kinetic Energy
Energy converted per second; Joule per second. Unit used to measure power
Watt
Kinetic Energy change resulting from increasing the velocity of the object in motion by 3x
9x the KE
Done when displacement is vertical and applied force on the object opposes the gravitational force on the object.
Work done against gravity
energy of position
Gravitational Potential Energy
= ½ kx2
Spring Potential Energy
The term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses
Horsepower
Gravitational Potential Energy change resulting from increasing the height of the object by 2x.
2x
= mass x gravitational acceleration
Force due to gravity - Fg
the work done by the net forces acting on an object equals the change in the energy of the object
Work Energy Theorem
= F d
Work
unit of force resulting from the multiplication of the mass times the acceleration (kgm/s2)
Newtons
Spring Potential Energy change resulting from increasing the mass of the object by 2x and increasing the compression distance of the spring by 2x.
4x more Spring potential -mass is not a factor in spring potential
Power increase resulting from doing the same work as before in half the time.
energy of motion.
Kinetic Energy
= Fd/t
Power
m/s2
acceleration
Kinetic Energy change resulting from decreasing the velocity of the object in motion by half.
1/4x as much energy