Everything contains energy. For this unit, we will learn how the energy transform into between object and how it is going to be calculated.
KEY TERMS
Potential Energy (PE)
Kinetic Energy (KP) Work (W) Power(P) Joules (J) |
the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
the energy that it possesses due to its motion a force is said to do work if, when acting, there is a movement of the point of application in the direction of the force. a change in the physical system and a specified time in which the change occurs a derived unit of energy in the International System of Units. |
Potential Energy (PE)
Elastic potential energy is the potential energy of an elastic object (for example a bow or a catapult) that is deformed under tension or compression (or stressed in formal terminology). It arises as a consequence of a force that tries to restore the object to its original shape, which is most often the electromagnetic force between the atoms and molecules that constitute the object. If the stretch is released, the energy is transformed into kinetic energy.
The amount of gravitational potential energy held by an elevated object is equal to the work done against gravity in lifting it. The work done equals the force required to move it upward multiplied with the vertical distance it is moved (remember W = Fd). The upward force required while moving at a constant velocity is equal to the weight, mg, of an object, so the work done in lifting it through a height h is the product mgh. Thus, when accounting only for mass, gravity, and altitude, the equation is: https://en.wikipedia.org/wiki/Potential_energy |
Kinetic Energy (KE)
In classical mechanics, the kinetic energy of a point object (an object so small that its mass can be assumed to exist at one point), or a non-rotating rigid body depends on the mass of the body as well as its speed. The kinetic energy is equal to 1/2 the product of the mass and the square of the speed. In formula form:
https://en.wikipedia.org/wiki/Kinetic_energy |
LOL Diagrams
Problem Set
1.While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute, displacing its center of mass by a distance of 8.5 cm for each pushup. Determine the total work done on the squirrel while moving upward (32 times).
2.During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed.
a. Determine the work done by Jerome in climbing the stair case.
b. Determine the power generated by Jerome.
1.10J
2.
a. 2.30 x 103 J
b. 1.73 x 103 W
https://www.physicsclassroom.com/calcpad/energy/problems
2.During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed.
a. Determine the work done by Jerome in climbing the stair case.
b. Determine the power generated by Jerome.
1.10J
2.
a. 2.30 x 103 J
b. 1.73 x 103 W
https://www.physicsclassroom.com/calcpad/energy/problems