1. Energy

2. DEFINITION OF ENERGY
Energy is the ability to do work or to cause a change. This property may be transferred from on object to another.

3. DEFINITION OF KINETIC ENERGY
The kinetic energy of an object is energy to an object’s relative motion. KE of and object with mass m and speed v is given by

4. THE WORK-ENERGY THEOREM
When a net external force does work on and object, the kinetic
energy of the object changes according to

5. Example
The mass of the space probe is 474-kg and its initial velocity
is 275 m/s. If the .056 N force acts on the probe through a
displacement of 2.42×109m, what is its final speed?

6. The Work-Energy Theorem and Kinetic Energy

7. The Work-Energy Theorem and Kinetic Energy

8. Gravitational Potential Energy

9. Gravitational Potential Energy
Example
The gymnast leaves the trampoline at an initial height of 1.20 m
and reaches a maximum height of 4.80 m before falling back
down. What was the initial speed of the gymnast?

11. DEFINITION OF GRAVITATIONAL POTENTIAL ENERGY
The gravitational potential energy is the energy that an object of mass m has because of its position relative to the surface of the earth.

12. THE WORK-ENERGY THEOREM

13. If the net work on an object by nonconservative forces
is zero, then its energy does not change:

14. THE PRINCIPLE OF CONSERVATION OF
MECHANICAL ENERGY
The total mechanical energy (E = KE + PE) of an object
remains constant as the object moves.

15. The Conservation of Mechanical Energy

16. THE PRINCIPLE OF CONSERVATION OF ENERGY
Energy can neither be created not destroyed, but can
only be converted from one form to another.
Types of Energy
Kinetic Potential
Radiant (Light) Gravitational
Thermal Chemical
Electric Elastic
Magnetic Nuclear
Sound Mechanical