Energy,Work And Force

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Wikipedia for work(physics)
Work,force and Energy
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Teaching Outlines

Concept#Introduction to Energy and its forms

Learning objectives

1. Definition of Force and work
2. Understand the terms of Mechanical Energy,Potential energy and Kinetic Energy
3. Obtain a Energy
4. Law of Conservation of Energy

Notes for teachers

These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.
Two aspects:

1. To studying motion
   
2. Movement of objects
   

The first is to define the framework, terms that we will use to describe the motion. The second is to understand what causes the motion and movement.

Describing Motion

Some ways of describing motion

1. Uniform motion in a straight line
   
2. Uniform circular motion
   

Motion in a straight line and uniform circular motion are two extreme positions of the acceleration changing only the speed or only the direction
Force may be defined as such an external cause that changes or acts to change the state of rest or of uniform motion of a body

Three laws of motion:
Newton's first law of motion
Newton's second law of motion
Newton's third law of motion

Law of Conservation of energy

The total energy of the system is conserved. Potential energy can be converted into kinetic energy and vice versa. But the total energy remains unchanged
In more general terms, the law of conservation of energy states that energy can neither be created nor destroyed; but can be transformed from one form to another
.

Activity No # What is Energy

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Interactive Simulation of Energy Energy-skate-park-basics

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• Developmental Questions (What discussion questions)
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          State Newton's law of motion

          What is an External unbalanced force?

          Which of the following has more inertia?

             a. A rubber ball and a stone of the same size

             b. A bicycle and a train

             c. A 5-rupee coin and a 1-rupee coin

          State true or false.

             a. Inertia is a force

             b. All objects have inertia

             c. Fast moving objects have more inertia than slow moving objects

             d. An object will have no inertia when there is no gravity.

             e. If a person is moving to the right, then the forces acting upon it are NOT balanced.

             f. It would take an unbalanced force to keep an object in motion

             g. A pendulum bob is set into its usual back and forth periodic motion.  After some time, the pendulum bob comes to a rest position.  This is best explained by the idea of inertia – all objects eventually resist motion.

             h. If an object is moving with a constant speed in a circle, then the forces acting upon the object are balanced.

             i. If an object is accelerating at a constant rate of acceleration, then the forces acting upon the object are balanced.

             j. A free-falling object experiences a balance of forces.

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Activity No #Potential Energy

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Interactive simulation of Force and Motion
Force and Motion

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        What is Potential Energy ?

        What are the types of Potential energy ?

        What is the two forms of Potential energy ?>br>

        Derive the equation of Gravitational potential energy ?

        Give the applications of potential energy ?

        A cart is loaded with a brick and pulled at constant speed along an inclined plane to the height
 of a seat-top. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45
 meters, then what is the potential energy of the loaded cart at the height of the seat-top?

        A body of mass 2kg is raised to a height of 25m. Calculate the potential energy possessed by the  body?>br>

        A bag of rice weighs 75kg. To what height is it raised if the work done in lifting it is 4900 J?

Question Corner

Concept # Difference Between Potential and Kinetic Energy

Learning objectives

1. Working of Potential and Kinetic Energy
2. Examples of potential and Kinetic Energy
3. Formula and Derivation of Potential and Kinetic Energy
4. Conservation of Mechanical Energy

Notes for teachers

These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.

Activity No #Kinetic Energy

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This Video use to explain about the potential energy ,kinetic Energy and transforming potential energy into kinetic energy

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       What is Kinetic Energy ?

 
       What are the types of Kinetic Energy ?

       A truck and a car are moving with the same kinetic energy on a road. 
       Their engines are simultaneously switched off. Which one will stop at 
       a lesser distance?

       A body of mass 75 kg has a momentum of 1500kg ms-1. Calculate its kinetic energy?

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