Energy - Mechanical Energy, Potential Energy and Kinetic Energy

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This presentation explains Energy, Mechanical Energy and the two types of mechanical energy.

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Presentation Transcript

What is ENERGY?:

What is ENERGY? -the capacity to do work Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

What is Work?:

What is Work? -the application of force over a displacement Work = Force x Displacement W = Fd or W = Fcos d Unit is Joules (J) Force displacement Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

What is Power?:

What is Power? -the rate of doing work Power = Work ÷ Time P = W ÷ t Unit is Watts (W) Force Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

ENERGY:

ENERGY WORK CAPACITY TO DO Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

Where can you find energy?:

Where can you find energy? Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

Different Forms of Energy::

Different Forms of Energy: Mechanical Energy Potential Energy Kinetic Energy Chemical Energy Electrical Energy Radiant Energy Thermal Energy Sound Energy Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

MECHANICAL :

MECHANICAL ENERGY -energy due to position or movement Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

Two types of Mechanical Energy::

Two types of Mechanical Energy: Potential Energy Kinetic Energy Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

Potential Energy:

Potential Energy -energy stored in an object due to its position -symbolized by PE -equal to the product of the mass, height and acceleration due to gravity PE = mgh Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

Potential Energy:

Potential Energy PE = mgh How much is the potential energy of a 10 kg stone lifted 2 m from the ground? h= 2 m m = 10 kg PE = mgh PE = (10 kg)(9.8 m/s 2 )(2 m) PE = 196 kgm 2 /s 2 PE = 196 J Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

Potential Energy:

Potential Energy PE = mgh How much is your potential energy at the top of the staircase? Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

2 types of Potential Energy:

2 types of Potential Energy Gravitational Elastic Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

kinetic Energy:

kinetic Energy -energy due to an object’s motion -symbolized by KE -equal to half of the product of the mass and square of the velocity KE = ½mv 2 Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

kinetic Energy:

kinetic Energy KE = ½mv 2 How much is the kinetic energy does a 45 kg girl has if she is running at 3 m/s? v= 3 m/s m = 45 kg KE = ½mv 2 KE = ½(45 kg)(3 m/s) 2 KE = 202.5 kgm 2 /s 2 KE = 202.5 J Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

kinetic Energy:

kinetic Energy KE = ½mv 2 How much is your kinetic energy when you were running up the staircase? Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

MECHANICAL :

MECHANICAL ENERGY -energy due to position or movement Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

QUESTIONS:

QUESTIONS An object has a mass of 5 kg. Calculate its potential energy 3 m above the ground. Calculate the kinetic energy of a 1000-kg car traveling at 0 km/h. Pinoy Techno Guide for Teachers - www.pinoytechnoguide.com

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