Kinetic Energy Lesson

Kinetic Energy

From the Greek kinetikos meaning to move

​Your text here

Draw

What is your favorite type of cookie?

Dropdown

When a person roller skates down a hill it is an example of ​

Select answer

. When a person is standing at the top of a hill on skates that is an example of ​

Select answer

.

​- All moving objects possess kinetic energy.

Think about where kinetic energy is located while a roller coaster is running?

Kinetic Energy

Notes are located on
Page 24
of the Notebook

​

​Kinetic Energy Notes

​is energy that moves objects

Examples:
- use legs to run
- car engine to run car
- shoveling dirt

​​Mechanical Energy

particles vibrate within air or water and carry sound energy

Structures in ear capture the energy carried by sound and then your brain interprets the vibrations

​​Sound

​is energy produced by charged particles

Example: getting shocked by slide

​​Electrical Energy

​Types of Kinetic Energy

Match

Match the example to the type of kinetic energy.

• Sound

• Mechanical

• electrical

whale songs carry though the ocean

pulling a lever opens a trap door

electrons flow through a copper wire

• whale songs carry though the ocean

• pulling a lever opens a trap door

• electrons flow through a copper wire

Occurs in MOVING objects

The faster an object moves, the more kinetic energy it has.

Measure in Joules

​

​Kinetic Energy

Multiple Choice

Who has more kinetic energy?

​Formula for Calculating KE

Kinetic Energy = 1/2 mv<sup>2

m = mass in kg
v = velocity in m/s

Located in you NOTEBOOK APPENDIX page 213</sup>

If the velocity (speed) remains the same:

the kinetic energy increases as the mass increases

​

Correlation between KE & Mass

Draw

What is the kinetic energy of an object with a mass of 100 kg that is moving at a velocity of 12.5 m/s?

Use KE = 1/2mv²

Draw

What is the kinetic energy of a 4 kg bowling ball that is moving 9m/s?

KE = 1/2 mv²

Multiple Choice

What is the kinetic energy of a 15 kg child sliding down a slide at 2m/s?

KE = 1/2 mv²

• 7.5 J

• 30 J

• 60 J

• 225 J

Multiple Choice

What is the kinetic energy of a 2 kg peregrine falcon diving at 80 m/s?

KE = 1/2 mv²

• 10 J

• 160 J

• 320 J

• 6,400 J

Poll

How comfortable are you feeling with calculating kinetic energy?

• I got this!

• I am starting to get this.

• I am a little confused.

• I am totally lost.

Draw

In your breakout room:

At which point (letter) does a train on this roller coaster,

A - Have the most gravitational POTENTIAL energy?

B - Have the most KINETIC energy?

C - Have BOTH kinetic and potential energy?

Multiple Choice

When does a roller coaster have the most kinetic energy?

• at the top of a hill because going slowest

• bottom of hill because going fastest

• bottom of hill because closest to the ground

We will be calculating Potential Energy!

Bring your calculator!

​
Monday will be a GRADED assignment with calculations. FYI!

​See You Tomorrow!