Welcome back Minions!!!

If you have 2 objects that have the same mass, what can be done to make one of the objects have greater kinetic energy?

If you have 2 objects where one has the greater mass than the other, what can be done to make sure the object with the greater mass has greater kinetic energy than the object with lesser mass?

Warm-Up

Define…◦ Energy

The ability to do work or cause change.◦ Work

The transfer of energy.◦ Power

The rate at which work is done◦ Kinetic Energy

Energy of motion.◦ Formula for Kinetic Energy

Review…

Quick Kinetic review…

Must an object be moving in order to have energy?◦ NO!!!

Some objects have stored energy as a result of their positions or shapes!

Energy at the ready!

This is Potential Energy!!!◦ Stored energy that results from the position or

shape of an object.

Potential Energy

Blue and Red skier…◦ Which has a greater

POTENTIAL ENERGY? Why?

Red and Green skier…◦ Which has a greater

POTENTIAL ENERGY? Why?

Gravitational Potential Energy◦ Potential Energy related to

an object’s height!

Look at the skier on pg 445!!!

Object Weighs 500 Newtons. It is 40 meters off of the ground. How many Joules of Potential Energy does it

Posess?

Examples of G.P.E.

Mr. Scott’s Car weighs 7000 Newtons. A student picks up his car and carries it to

the top of a 30 meter tree! What is the potential energy of Mr. Scott’s

car?

Now you try!

Stretching an object creates potential energy.

Look at a rubber band comparison!

What about a spring?

Elastic Potential Energy◦ Potential energy associated with objects that can

be stretched or compressed.

Streeeeeeeeeeetch!!!!

What is energy? How are energy, work, and power related? If a handsaw does the same amount of work

on a log as a chainsaw does, which has the greater power? Why?

What is Kinetic Energy? What is Potential Energy? What factors affect an object’s kinetic

energy? What factors affect an object’s potential

energy?

Review Section 1…

Pay attention to Mr. Scott so he can tell you!!!

Homework for tonight…

Calculate your weight in Newtons.◦ (Weight) x (4.448) = Newtons

You are about to jump off a high dive into a swimming pool. The high dive is 8 meters tall.

What is your potential energy in Joules before you jump off of the high dive?

Out the door…