What is Energy Energy is the ability to cause change or The ability to do work Energy is measured in the same units Joules as work because energy transfers work Different Forms of Energy ID: 546733
Download Presentation The PPT/PDF document "Describing Energy" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Describing EnergySlide2
What is Energy?
Energy
is the ability to cause change.
or….. The ability to do work.
Energy is measured in the same units (Joules) as work because energy transfers work.Slide3
Different Forms of Energy
Chemical potential energy
Electrical energy
Radiant energySlide4
Types of Energy
Kinetic Energy
: the energy due to motion.
Kinetic energy (J) = ½ x mass (kg) x [speed (m/s)]
2Slide5
Calculating Kinetic Energy
Example 1:
A baseball with a mass of 0.15 kg is moving at a speed of 40.0 m/s. What is the baseball’s kinetic energy from this motion?
120 J
Example 2:A jogger with a mass of 60 kg is moving forward at a speed of 3.0 m/s. What is the jogger’s kinetic energy?270 JSlide6
Types of Energy
Potential
: the energy that is stored due to the interactions between objects.
3 Types:
Chemical: energy due to chemical bondsElastic: energy that is stored by compressing or stretching an object.Gravitational: energy that is due to the gravitational forces between objectsSlide7
Calculating GPE
Gravitational Potential Energy equation:
GPE (J) = mass (kg) x Gravity (N/kg) x height (m)
Example:
A 4.0 kg ceiling fan is placed 2.5 m above the floor. What is the gravitational potential energy of the Earth-ceiling fan system?98 J