1. Energy
Energy-the ability to do work.
-Because work and energy are so
closely related, they are expressed in
the same units. JOULES (J)
When a given amount of work is
done, the same amount of energy is
involved.

2. Kinetic Energy
• Kinetic energy is energy of motion:
-All moving objects have kinetic energy.
- Objects with kinetic energy can do work.
*When you are bowling, and you throw the ball
down the lane, you are using kinetic energy.
By throwing the ball, you are transferring your
kinetic energy to the ball. The bowling ball will
then transfer energy to the pins.

3. Kinetic Energy depends…..
• On speed and Mass!!!
• An objects kinetic energy can be determined by
the following equation:
» Kinetic energy= mv²/2
REMEMBER!!! V is for SPEED!!!

4. Previous slide continued
• M=mass of object
• V= objects speed
• The faster something is
moving, the more kinetic
energy it has.
• The more massive a
moving object is, the
more kinetic energy it
has.
• Speed has a greater
effect on kinetic energy
than mass does.

5. Potential Energy is Energy of Position
• Potential energy- is the energy that an object
has because of its position or shape.
• Ex- a stretched bow, or a rubber band. When
you pull back on a bow, energy is present
because work was done to change its shape.

6. Gravitational Potential Energy
• Depends on weight and height.
• As you lift an object, you do work on the
object by using a force that opposes
gravitational force.
• You then give that object gravitational
potential energy. Ex- lifting up your book bag.
• The amount of gravitational potential energy
an object has depends on its weight and how
far above Earth’s surface it is.

7. Gravitational Potential Energy
• Gravitational Potential Energy=weight x height
• Since weight is expressed in Newton's, you
would work out the problem as follows:
• N · M= (J)
• Newton's x Meters = Joules

8. Mechanical Energy
Mechanical Energy sums it all up.
Mechanical Energy- is the total energy of motion
and position of an object.
Mechanical energy can be all potential
energy, all kinetic energy or some of both.
Mechanical Energy= potential energy + kinetic energy