Energy and Work Section 10.1 Physics. Objectives Describe the relationship btwn work and energy. Display an ability to calculate work done by a force.

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Presentation transcript:

Energy and Work Section 10.1 Physics

Objectives Describe the relationship btwn work and energy. Display an ability to calculate work done by a force. Identify the force that does work. Differentiate btwn work and power and correctly calculate power used.

Energy Energy: the ability of something to produce change in itself or the environment. Energy can come in many forms: –Thermal Energy. –Chemical Energy. –Potential Energy. –Kinetic Energy.

Energy Kinetic Energy: Energy of motion. To find kinetic energy mathematically, there is one main equation: –KE = ½ (m)(v²) –Kinetic energy equals one half mass times velocity squared.

Energy and Work Energy and work are related. Energy is used to do work. Work: The process of changing the energy of the system. Ex. Raking leaves. –System: you and raking leaves. –Chemical energy is changed into kinetic energy to rake the leaves.

Work W = Fd –Work equals force times distance. –The relationship between doing work and a resulting change in energy, W = ΔK. –Work-Energy Theorem: founded by James Prescott Joule. –Energy is measured in Joules: J.

Work Can work be done on an object such as a brick wall? No. The object on which the force is applied must move through a distance!

Practice Problems Page

Forces at an Angle W = Fd If a force is applied at an angle, the components need to be calculated. F x = F (cos Θ) F y = -F (sin Θ) Or to find the work: –W = Fd (cosΘ)

Practice Problems Page

Power and Work Power is the rate of doing work. P = W/t –Power equals work divided by time.

Practice Problems Page

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