Intro To Energy

Warm Up: 1. What do you already know about energy? 2. What are you hoping you will learn about energy?

Take the Pop Quiz DON'T worry about your grade-its just for fun!

Watch the clip and take notes about the energy involved.

Write a definition for the word ENERGY. Use what you know, what you saw in the video and what you experience each day.

Share your definition with your partner. Discuss and refine.

Energy is the ability to do work Work is a transfer of energy from one object to another! For work to occur, a force must move an object IN THE SAME direction as the object moves Energy is measured using the unit Joules

Use p88-89 in the hardcover text Decide whether each of the following is work Place each job in the correct column; explain why Add 2 examples of your own to each column Pulling a wheeled suitcase Carrying a suitcase Picking up your books Carrying your books down the hall

Visualizing Energy and Work What have I read????? Read pages 88, 89, 116 in the hard cover text Read pages 2-3 in the soft cover book Draw a sketch that shows how energy and work are related. (use figure 1 on page 116 as an example but draw a different activity for your product)

Label your picture Figure 1 Write a caption on the front Label 2 places on the picture where work or energy are present (use speech bubbles) On the back, write a paragraph that explains work and energy and how each is illustrated in your picture

Figure 1: When one object does work on another, energy is transferred. The tennis player can do work on her racket because she has energy. When the racket does work on the ball, the ball gains the ability to do work on something else. Energy is transferred from the racket to the ball.

What do each of these pictures have in common?

They all show the energy of moving matter!

Mass vs Distance Critical Thinking Y ou will be launching metal washers and measuring the distance they travel. You will then graph this data and draw some conclusions. Guiding Question: Hypothesis: (If-then format) Claim (conclusion): Evidence:Justification of evidence:

# WashersDistance Traveled Collect data Graph Analyze trends

Kinetic energy is the energy of motion List some examples:

The amount of kinetic energy depends upon both MASS and VELOCITY Kinetic energy (KE)= mass * velocity2 2

Since Kinetic energy (KE)= mass * velocity2 2 Which has a larger impact on KE (mass or velocity)? Why?

List the 3 vehicles below in order from most KE to least KE. Explain why you have them in that order.

KE PROBLEMS… 1. What is the KE of a car that has a mass of 1,200 kg and is moving at a speed of 20 m/s? 2. What is the KE of a car that has a mass of 2,400 kg and is moving at a speed of 20 m/s? 3. How does the kinetic energy of the 2 cars above compare? What do you notice?

Potential energy is energy that is stored due to shape or position Describe how the leaves on these trees have energy.

Gravitational potential energy is energy of position It is depends upon weight and height It is the amount of work done to get the object to that position Gravitational Potential Energy = weight * height

Find the GPE for each diver. Both boards are 5m high.

Find the GPE for each diver. Board C is 10m high; board D is 5m high.

Elastic potential energy is due to an object's shape Amount of energy put in to stretch or compress What are some examples of elastic potential energy?

What specific type of potential energy is found in each picture? Why?

Energy conversions occur when GPE changes into KE and back again. The Law of Conservation of Energy states that energy is NOT created or destroyed. It can only change from one form to another.

Describe the energy conversions on a trampoline.

Describe the energy conversions on a swing.

What happened to the energy?!

Mechanical energy is the total energy of motion and position. ME=KE + PE