Potential and Kinetic Energy

How is all energy divided? Potential Energy Kinetic Energy All Energy Gravitation Potential Energy Elastic Potential Energy Chemical Potential Energy

What is Potential Energy? oEnergy that is stored and waiting to be used later

Potential Energy The energy that an object has because of the position, shape, or condition of the object is called potential energy. Potential energy is stored in many ways. Elastic potential energy is the energy stored in any type of stretched or compressed elastic material, such as a spring or a rubber band.Elastic potential energy is the energy stored in any type of stretched or compressed elastic material, such as a spring or a rubber band. Gravitational potential energy is the energy stored in the gravitational field which exists between any two or more objects.Gravitational potential energy is the energy stored in the gravitational field which exists between any two or more objects. Chemical potential energy is energy stored in a compound or element that can be released during a chemical change.Chemical potential energy is energy stored in a compound or element that can be released during a chemical change.

What is Gravitational Potential Energy? oPotential energy due to an object’s position oP.E. = mass x height x gravity height x gravity Don’t look down, Rover! Good boy!

Potential Energy Gravitational potential energy depends on both mass and height. Gravitational Potential Energy Equation grav. PE = mass  free-fall acceleration  height E pg = mgh  units kg * m/s 2 x m or Joules E pg = mgh  units kg * m/s 2 x m or Joules The height can be relative. The height used in the above equation is usually measured from the ground.The height used in the above equation is usually measured from the ground. However, it can be a relative height between two points, such as between two branches in a tree.However, it can be a relative height between two points, such as between two branches in a tree.

What is Elastic Potential Energy? oPotential energy due compression or expansion of an elastic object. Notice the ball compressing and expanding

Potential Energy Elastic potential energy depends on the distance an object can be compressed or stretched. Elastic Potential Energy Equation elas. PE = ½ x spring constant  (stretch distance) 2 E s = ½ kd 2  units N/m x m 2 or Joules (J) The spring constant (k) Is determined by measuring the force needed to stretch or compress a spring.Is determined by measuring the force needed to stretch or compress a spring. k = Force/distance  units N/m

What is Chemical Potential Energy? oPotential energy stored within the chemical bonds of an object

What is Kinetic Energy? oEnergy an object has due to its motion oK.E. =.5(mass x speed 2 )

Kinetic Energy The energy of a moving object due to the object’s motion is called kinetic energy. Kinetic energy depends on mass and speed. Kinetic Energy Equation Kinetic energy depends on speed more than mass.  units kg * m 2 /s 2 or J

Using you book Complete practice problems 1-4 & 1-3 From pages 393 & 394