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# Potential and Kinetic Energy

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## Kyle McAlister

on 6 March 2015

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#### Transcript of Potential and Kinetic Energy

Total Mechanical Energy (TME) is....
the ability to cause change within a system
Energy
the sum of all the potential and kinetic energy in a system
Kinetic Energy
energy that is in an object is due to its motion
Energy is measured in
joules
calories
or kilocalories
Potential Energy
the energy stored in a system due to the relative position of objects (large or small)
Types of potential energy:
gravitational
elastic

is influenced by the objects mass and height
Gravitational Potential Energy
(PE= mgh)
Elastic Potential Energy
is stored by things that stretch, twist, or compress
(rubberband example)
depends on:
1. Speed
2. Direction
3. Mass
does NOT depend on:
1. Shape
2. Size
3. Material
Kinetic Energy
Law of Conservation of Energy:
Energy cannot be

http://www.energyeducation.tx.gov/energy/section_1/topics/what_is_energy/index.html
created or destroyed
airsoft gun vs paint ball guns
Energy upon striking skin at a speed of 90 meters/second:

Paintball Pellet: E = ½(.00284kg)(90m/s) ² = 11.50 Joules
Airsoft Pellet: E = ½(.0002kg)(90m/s) ² = 0.81 Joules
Pro Baseball pitch: E = ½(.145kg)(41m/s) ² = 120 Joules
Pro Tennis Serve: E = ½(.06kg)(63m/s) ² = 120 Joules
Chemical Potential Energy
http://www.childrensuniversity.manchester.ac.uk/interactives/science/energy/what-is-energy/
stored within the bonds of atoms and molecules of a substance
(What did you eat for lunch today?)
Total Mechanical Energy:
is the total energy within a system
Mechanical energy due to location
Energy
Mechanical
Non- Mechanical
Potential
Chemical
Electrical
Nuclear
Energy of motion
and
position
Kinetic
http://www.cedarpoint.com/
What is Energy?
Is energy a thing? Or is it a property or a condition of a thing? How do we really define it? How was it discovered? What are its properties?
Energy is . . .
or
The ability to do work to a system

What then is work?
Work = F x d
Force
Displacement
Energy of location
Energy of movement
Energy is conserved
PE to KE
KE to PE
Energy Transfer
Both
Energy
and
Work
have the unit
Joules (J)
in the metric system.
What is work then?
If you were working with this dude and filled the hole back in how much work would you do?
aside from the equation.
Work is the placement of energy into or out of the system
1. A cart is loaded with a brick has a mas of 3.0 kg and pulled up an inclined plane to the height of .45 m.What is the potential energy of the loaded cart at the height of ramp?
You Try Some Problems
2. A box has a mass of 5.8kg. The box is lifted from the garage floor and placed on a shelf. If the box gains 145J of Potential Energy (PE), how high is the shelf?
3. A 800g ball is pulled up a slope as shown in the diagram. Calculate the potential energy it gains.
50 cm
20 cm
Hint: remember to
convert to meters.
PE = mgh
What has more potential energy?
Which has more PE?
Why?
KE = 1/2 m v
2
A .003 kg lump of ice falls from an airplane as it comes in to land. If the ice hits the ground with a vertical speed of 85m/s, what was the height of the plane when the ice fell off?
A. What is your kinetic energy at the time of impact?
B. What is the maximum Potential energy?
C. Solve for height
Energy on a small scale
It is any energy that is not dependent upon
motion or location.
Nonmechanicale energy :
heat energy
light energy (electromagnetic)
chemical energy
nuclear energy.
**Once again, you CANNOT SEE nonmechanical energy**
Mechanical energy is large scale and nonmechanical energy is small scale. By small scale I mean the scale of atoms. Mechanical energy can be broken down to GPE (gravitational potential energy) and KE kinetic energy. If something possess mechanical energy you can SEE it.
If you CAN SEE things such as heat energy or X-rays, you may have mutant powers, promise to use them for good and not evil
Okay, I know you can see light but you can't see the photons. You also can't see X-rays or microwaves.
1. Is it possible for a motorcycle to have more kinetic energy than a truck?
4. A bike rider is equipped with a monitor measuring his energy output. As he approaches a hill he has a speed of 8.5 m/s and his energy output is 3.1 x 10^3 J. What is the riders mass?
A 500 kg pig is standing at the top of a muddy hill on a rainy day. The hill 30.0 m high. The pig slips and begins to slide down the hill. What is the pig’s speed at the bottom of the hill?
a. find potential energy initial
b. What is kenetic energy final
c. what is speed?
A Mexican jumping bean jumps with the aid of a small worm that lives inside the bean. If a bean of mass 2.0 g jumps 1.0 cm from your hand into the air….
a) How much potential energy has it gained in reaching its highest point.
b) What is its speed as the bean lands back in the palm of your hand?
2. A 3 kg ball is rolling 2 m/s. How much kinetic energy does it have?
3. A car has a mass of 2,000 kg and is traveling at 28 meters per second. What is the car’s kinetic energy?
PE + KE = TME
Which has more Kinetic Energy?
Why?
So think of a 1 KG Water balloon dropped from a window that is
88 m High.
How much PE do we have initially?
How much KE do we have initially?
Initially
Final
How much PE do we have finally?
How much KE dow we have finally?
PE + KE = TME
i
i
PE + KE = TME
f
f
BOTH ARE Equal to TME
SO ...
PE + KE = PE + KE
i
i
f
f
ENERGY REVIEW
Which of the following is a measure of the ability to do work?
1. Power
2. Energy
3. Photosynthesis
4. Joules
Which of the following does a flying Frisbee have the most of?
1. Mechanical potential energy
2. Non-mechanical potential energy
3. Mechanical kinetic energy
4. Non-mechanical kinetic energy
Which of the following best describes the motion of the atoms in a cup of hot chocolate?
1. Mechanical potential energy
2. Non-mechanical potential energy
3. Mechanical kinetic energy
4. Non-mechanical kinetic energy
Which of the following best describes a wound up clock spring?
1. Mechanical potential energy
2. Non-mechanical potential energy
3. Mechanical kinetic energy
4. Non-mechanical kinetic energy
Which of the following best describes a clock spring unwinding?
1. Mechanical potential energy
2. Non-mechanical potential energy
3. Mechanical kinetic energy
4. Non-mechanical kinetic energy
Which of the following best describes a skateboarder sitting at the top of a hill?
1. Mechanical potential energy
2. Non-mechanical potential energy
3. Mechanical kinetic energy
4. Non-mechanical kinetic energy
A boulder has 600 J of PE. Ignoring air resistance, approximately how much KE does it have right before it hits the ground?