tuesday, february 14th happy valentines day!. bell work draw a transverse wave and label its crest,...
TRANSCRIPT
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Tuesday, February 14th
Happy Valentines Day!
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Bell Work
• Draw a Transverse Wave and label its crest, trough, amplitude, and wavelength.
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Tuesday, February 14th
Happy Valentines Day!Kinetic Energy & Potential Energy
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Goals for Today:
• Content Objective: given an object’s mass and velocity, and the equation for Kinetic Energy, you will be able to calculate the object’s KE using THE 4 STPES!
• Literacy Objective: You will be able to define kinetic energy and give an example of an object that has some.
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Does the Ball have Energy?
• When I hold the baseball, does it have energy?
• When I drop it, does it have energy when it is falling?
• What about when it hits the ground?• Where did that energy come from?
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The Baseball had 2 Types of Energy
• Potential Energy – stored energy, due to position (above the ground) or condition
• Kinetic Energy - energy a moving object has because of its motion
• When did the ball have Potential Energy?• When did it have Kinetic Energy?
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Kinetic Energy
• All moving objects have Kinetic Energy• A moving car, a thrown javelin, a rolling
bowling ball, a running horse, someone riding a dirt bike
• We can calculate the amount of kinetic energy a moving object has using the equation:
KE = ½ * mass * velocity2
KE = ½ m v2
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KE = ½ * mass * velocity2
• Kinetic Energy depends on:– MASS– VELOCITY
• Kinetic Energy is measured in Joules– “ J ” for short
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I’ll use THE 4 STEPS to solve for KE:
• A person riding a dirt bike is traveling at 15 m/s. The weight of the bike and the person total 140 kg. What is their Kinetic Energy (KE)?
• Step 1. What Information are we given?• Step 2. What information do we need?• Step 3. What equation will we use?• Step 4. Insert Info and Solve.
KE = ½ m v2
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Now let’s try Together
• A horse is walking around, grazing. He weighs 520 kg and is moving at 2 m/s. What is it’s Kinetic Energy?
• Step 1. What Information are we given?• Step 2. What information do we need?• Step 3. What equation will we use?• Step 4. Insert Info and Solve.
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Try one in your Groups• You are target shooting, using 9 mm bullets.
The bullets weigh 0.115 kg and travel at a velocity of 340 m/s once they’re shot. What is this moving bullet’s Kinetic Energy?
• Step 1. What Information are we given?• Step 2. What information do we need?• Step 3. What equation will we use?• Step 4. Insert Info and Solve.
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On Your Slip of Paper
• 1. Please define Kinetic Energy. Give an example of an object that has Kinetic Energy.
• 2. Using THE 4 STEPS, find the Kinetic Energy of a school bus with mass 10,000 kg if it is traveling down Beavercreek Road at 20 meters/second?
• --When You Are Done: Flip Paper Over, Remain Quiet, and Relax
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A Couple Energy Jokes
• Why did the Gardner plant a light bulb?• He hoped to grow a Power Plant!• For this one, know that electricity is
measured in a unit called a “Watt”• As Seen on a Sign off Hwy 213:–You Can Trust Our Electricians, We Know
Watts Watt.
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We Already Introduced Potential Energy, but let’s refresh our brains:
• Potential Energy – stored energy, due to position (above the ground) or condition
• I’ve found the man with the MOST Potential Energy – a type of energy called Gravitational Potential Energy
• http://www.youtube.com/watch?v=e335kbl9YWc&feature=player_embedded
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Gravitational Potential Energy
• Today we are going to be talking about a type of Potential energy called Gravitational Potential Energy
• Gravitational Potential Energy – stored energy by objects due to their position above Earth’s surface
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Gravitational Potential Energy
• Anything that can fall has stored energy• Amount of Potential Energy depends on:– The object’s mass – How high above the Earth’s surface it is (height)
• The equation for GPE GPE= mass *gravity * height
GPE = mgh
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Climber Man’s GPE
• GPE = mass * gravity * height• Let’s Say he weighs 160lbs, which = 80 kg• Gravity is always 9.8 m/s/s• Climber man stood at 1,768 feet at the top.
1,768 ft = 540 meters• GPE = mass * gravity * height• GPE = (80kg)(9.8 m/s/s)(540m)• GPE = 423,360 J
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What does 423,360 J really mean?
• If Climber Man fell into a 10,000 gallon pool, his 423,360 J would be able to instantly raise the temperature of the 10,000 gallons by 1 degree C!
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Comparing Object’s GPE
• Let’s compare one student sitting on a stool.• To one student sitting on a text book. • Let’s assume the students have about the
same mass• Who has more Gravitational Potential Energy?
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Another Comparison
• A hiker just summitted Mt. Hood, which stands about 11,000 feet tall. He stands proudly on the snowy mountain ground and poses for a picture.
• A second hiker, starting her journey, pulls over in Government Camp and stands on dry, snow-less pavement planning her hike on her map.
• Which of the two hikers has more Gravitational Potential Energy?
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Other Side of your Slip of Paper
• A can of Monster Energy drink is sitting on the top shelf in your refrigerator. Two shelves below is a can of Mountain Dew.
• Which of the two energy-filled drinks has the most Gravitational Potential Energy.
• Why?