Energy 2 TYPES Kinetic Energy Potential Energy Mechanical

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Energy 2 TYPES Kinetic Energy Potential Energy Mechanical Energy

Energy 2 TYPES Kinetic Energy Potential Energy Mechanical Energy

ü The ability to do work ü Expressed in joules (J) 2 TYPES Kinetic

ü The ability to do work ü Expressed in joules (J) 2 TYPES Kinetic Energy Potential Energy

ü Energy of motion Examples include: • dribbling a basketball • a moving vehicle

ü Energy of motion Examples include: • dribbling a basketball • a moving vehicle • a flying bird

ü Energy of position or shape Examples include: • A basketball sitting on the

ü Energy of position or shape Examples include: • A basketball sitting on the floor • A parked car • a bird sitting on a branch • w = weight • h = height • If weight or height increase then GPE increases

Potential or Kinetic Energy? An archer who has pulled the bow string back to

Potential or Kinetic Energy? An archer who has pulled the bow string back to fire an arrow. While he or she is taking aim, nothing is moving.

Potential Energy The energy of position or shape! PE = W x H Q:

Potential Energy The energy of position or shape! PE = W x H Q: How could we increase the potential energy of the bow? A: The archer should pull the bow back farther! (basically increased the “height”)

Potential or Kinetic Energy? A stretched rubber band.

Potential or Kinetic Energy? A stretched rubber band.

Potential Energy The energy of position or shape! PE = W x H Q:

Potential Energy The energy of position or shape! PE = W x H Q: How could we increase the potential energy of the rubber band? A: Stretch the rubber band farther!

Potential or Kinetic Energy? A car driving down the road.

Potential or Kinetic Energy? A car driving down the road.

Kinetic Energy The energy of motion or movement! A 1: Increase 2 KE =

Kinetic Energy The energy of motion or movement! A 1: Increase 2 KE = mv /2 the speed of Q: How could we increase the kinetic energy of the car? the car! Note: Using a bigger car S PE ED would also ! increase KE, but which would have a greater effect?

Potential or Kinetic Energy? A baseball player waiting patiently at the plate for the

Potential or Kinetic Energy? A baseball player waiting patiently at the plate for the right pitch.

Potential Energy The energy of position or shape! PE = W x H Q:

Potential Energy The energy of position or shape! PE = W x H Q: How could we increase the potential energy of the bat? A: Use a heavier bat!

Potential or Kinetic Energy? A baseball player fielding a ground ball.

Potential or Kinetic Energy? A baseball player fielding a ground ball.

Kinetic Energy The energy of motion or movement! Q: How could we increase the

Kinetic Energy The energy of motion or movement! Q: How could we increase the kinetic energy of the player? Ball? A: Increasing the speed of the player. Same with the ball!

ü Total Energy of motion and position of an object ü ME = KE

ü Total Energy of motion and position of an object ü ME = KE + PE ü PE = KE ME remains constant!! ü An object can have both PE and KE, but NOT at the same time! ü Energy Skate Park

• Mechanical energy is the movement of machine parts. • Mechanical energy is

• Mechanical energy is the movement of machine parts. • Mechanical energy is also the total amount of kinetic and potential energy in a system. • Wind-up toys, grandfather clocks, and pogo sticks are examples of mechanical energy. • Wind power uses mechanical energy to help create electricity. Mechanical Energy = Potential energy + Kinetic energy

Potential energy + Kinetic energy = Mechanical energy Example of energy changes in a

Potential energy + Kinetic energy = Mechanical energy Example of energy changes in a swing or pendulum.

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