Learning Goals:
• Predict the kinetic and potential energy of objects. • Examine how kinetic and potential energy interact with each other.

In the space provided, define the following words:
Kinetic energy-is the energy of motion. An object that has motion - whether it is vertical or horizontal motion

Potential energy-is the energy of an object or a system due to the position of the body or the arrangement of the particles of the system

Open Internet Explorer. From the FMS Jump Page. Click the Potential and Kinetic Energy Skate Park link. Or type in http://phet.colorado.edu/en/simulation/energy-skate-park

Observations of KE and PE
Start your skater at the top of the track. Draw or write what happens to the skater.

|Position of Skater |Result |Possible reasons why it happened. | |[pic] |The Skater keeps going back and fourth. |It never stops because it keeps getting KE | | | |& PE. |

Click on [pic] and run your skater through the track again. Use this tool to help you label the spots on the ramp where there is the greatest KE and PE. Label your results below: [pic]

Watch what happens to the PE as the skater is higher on the track. What is the relationship between the PE and the height of the skater on the track? The PE gets greater when the skater gets higher up on the track.

Watch what happens to the KE as the skater moves faster and slower on the track. He is slowest at the top of the track just before he reverses direction and fastest at the bottom of the bend. What is the relationship between the KE and the speed of the skater on the track?

Watching the bar graph…what general statement can you make about the relationship between KE and PE?

...Part B
Now, suppose that Zak's younger cousin, Greta, sees him sliding and takes off her shoes so that she can slide as well (assume her socks have the same coefficient of kinetic friction as Zak's). Instead of getting a running start, she asks Zak to give her a push. So, Zak pushes her with a force of 125 \rm N over a distance of 1.00 \rm m. If her mass is 20.0 \rm kg, what distance d_2 does she slide after Zak's push ends?
Remember that the frictional force acts on Greta...

...KINETICENERGY
Objects have energy because of their motion; this energy is called kineticenergy. Kineticenergy of the objects having mass m and velocity v can be calculated with the formula given below;
K=1/2mv²
Kineticenergy is a scalar quantity; it does not have a direction. Unlike velocity, acceleration, force, and momentum, the...

...uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 3 kg weight is hanging on the string. The system of the weight and disk is released from rest.
a) When the 3 kg weight is moving with a speed of 2.2 m/s, what is the kineticenergy of the entire system?
KETOT = KEwheel+KEweight
= (1/2)(I)(w2)+(1/2)(m*v2)
=(0.5* v2)(m+1/2M)
=0.5*(2.2^2)*(3+(.5*15)) J
b) If the system started from...

...of mass m initially at speed u collides head-on (without rotation) with a stationary puck of mass M. Find the velocities of both puck after the collision if: i) the collision is fully elastic ii) the collision if fully inelastic. i) momentum: kineticenergy: mu = mv+MV (+ve in direction of initial u) 1 /2 m u2 = 1/2 m v2 + 1/2 M V2
2 eqns in 2 unknowns: V = (u - v) m/M substitute in K eqn: u2 = v2 + (M/m) V2 = v2 + (M/m) (u - v)2 (m/M)2 = v2 + (u - v)2 (m/M) let...

...
Potential Energy:
Potential energy is the stored energy of position possessed by an object.
Potential Energy Formula :
Potential Energy: PE = m x g x h
Mass:
Acceleration of Gravity:
Height:
where,
PE = Potential Energy,
m = Mass of object,
g = Acceleration of Gravity,
h = Height of object,
Examples:
1. A cat had climbed at the top of the tree. The Tree is 20 meters...

...Potential and KineticEnergy lab report
Caty Cleary
4th period
Problem statement:
How does the drop height (gravitational potential energy) of a ball affect the bounce height (kineticenergy) of the ball?
Variables:
Independent variable- drop height
Dependent variable- bounce height
Controlled variables (constants) - type of ball, measurement(unit), place bounced, and the materials used for each experiment....

...Equivalence.
Potential Energy
Potential energy is the same as stored energy. The "stored" energy is held within the gravitational field. When you lift a heavy object you exert energy which later will become kineticenergy when the object is dropped. A lift motor from a roller coaster exerts potential energy when lifting the train to the top of the hill. The higher the train is...

...KineticEnergy:
Consider a baseball flying through the air. The ball is said to have "kineticenergy" by virtue of the fact that its in motion relative to the ground. You can see that it is has energy because it can do "work" on an object on the ground if it collides with it (either by pushing on it and/or damaging it during the collision).
The formula for Kineticenergy, and for some of the...

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