Grab the Girl on a Bike Picture

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Presentation transcript:

Grab the Girl on a Bike Picture Where ever you have room make the following chart Form of Energy From Transferred/ transformed to Work or change it caused https://phet.colorado.edu/en/simulation/energy-forms-and-changes

Critical Question: What is the difference between potential and kinetic energy

Overview Work, Power, Energy Notes

ENERGY WORK POWER MECHANICAL ENERGY POTENTIAL ENERGY KINETIC ENERGY CONSERVATION OF ENERGY MACHINES EFFICIENCY ENERGY FOR LIFE

ENERGY The property of an object or a system that enables it to do work. Measured in joules (J)

ENERGY Only the effects of energy are seen. Energy transferred from one place to another.

WORK The application of a FORCE. The MOVEMENT of something by that FORCE. Force x distance = WORK

W = F x d WORK DONE AGAINST ANOTHER FORCE Archer stretches bowstring against elastic forces of the bow.

W = F x d WORK DONE TO CHANGE A SPEED OF AN OBJECT Acceleration or stopping a car.

WORK THE MEASUREMENT The Joule is a N x m 1 joule of work is done when the force of 1 N is exerted of a distance of 1 meter

POWER The rate at which work is done. Power = 𝑤𝑜𝑟𝑘 (𝐽) 𝑡𝑖𝑚𝑒 (𝑠) Watt (W) is a joule per second

POWER PROBLEM If a forklift is replaced with a new forklift that has twice the power, How much greater a load can it lift in the same amount of time?

POWER PROBLEM If it lifts the same load, how much faster can it operate?

MECHANICAL ENERGY Energy due to the position or the movement of of “something”. Potential energy Kinetic energy

POTENTIAL ENERGY Energy that is in a stored state and has the “potential” to do work. Fossil fuels, electric batteries and food contain Potential energy.

Gravitational Potential Energy Potential energy due to elevated positions. Gravitational Potential energy = weight x height PE = mgh

Gravitational Potential Energy GPE = Wt. x h Or GPE = m x g x h

Potential Energy Problems How much work is done on a 100 N boulder when you lift it 1 m? What power is expended if you lift the boulder a distance of 1 m in a time of 1 s?

Potential Energy Problems What is the gravitational potential energy of the boulder in the lifted position?

Kinetic Energy Energy of motion KE = ½ mv2 When you roll a ball you do work on it to give it speed. The moving ball can hit something and to work on it.

Kinetic Energy Forms Thermal energy Acoustical energy Radiant energy

Pendulum

Pendulum Maximum Potential Energy Zero Kinetic Energy

Pendulum Zero Kinetic Energy Maximum Kinetic Energy Maximum Potential Energy Zero Kinetic Energy Maximum Kinetic Energy Zero Potential Energy

Pendulum Zero Kinetic Energy Maximum Kinetic Energy Maximum Potential Energy Zero Kinetic Energy Maximum Kinetic Energy Zero Potential Energy

Pendulum Maximum Potential Energy Zero Kinetic Energy Maximum Kinetic Energy Zero Potential Energy

Pendulum Maximum Potential Energy Maximum Potential Energy Zero Kinetic Energy Zero Kinetic Energy Maximum Kinetic Energy Zero Potential Energy

Energy cannot be created or Law of Conservation of Energy Energy cannot be created or only changed destroyed,

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