Energy Energy forms can be transferred into an object or transformed into an object System anything under observation surrounding anything that’s not system. universe = system + surroundings 

kinetic engergy Mechanical kinetic energy: energy of an object that is in motion  Radiant energy: energy of electromagnetic waves from an energy source (UV, solar visible light, infrared)Thermal energy: energy of random motion of particles in a substance (heat)  Sound energy: energy of vibrations of particles

2. NUTRTIONAL NEEDS 

We need food to obtain nutrients and to satisfy a rage of needs.

-Structural: we need proteins to help us grow and to maintain our bodies.

-Providing energy: we need carbohydrates and lipids in order to do sports or to move about. 

-Regulatory: we need a range of minerals for our bodiesto function properly.

2.1. STRUCTURAL NEEDS

The most important structural nutrients are proteins, although certain lipids are also important, such as the ones that form cell membranes, as are certain

1. Light travels in straight lines and is a form of energy that can be reflected, refracted, and absorbed.

2. Reflection occurs when light bounces off a surface. The angle of incidence (incoming light) is equal to the angle of reflection (outgoing light).

3. Refraction occurs when light passes through a medium and its speed changes. This causes the light to bend. The amount of bending depends on the angle of incidence and the properties of the medium.

4. A lens is an optical device that can refract light and create

2. NUTRTIONAL NEEDS 

We need food to obtain nutrients and to satisfy a rage of needs.

-Structural: we need proteins to help us grow and to maintain our bodies.

-Providing energy: we need carbohydrates and lipids in order to do sports or to move about. 

-Regulatory: we need a range of minerals for our bodiesto function properly.

2.1. STRUCTURAL NEEDS

The most important structural nutrients are proteins, although certain lipids are also important, such as the ones that form cell membranes, as are certain

Q # 1. The potential is constant throughout a given region of space. Is the electric field zero or non zero in

this region? Explain.

Ans. The electric field intensity is described by the relation:

According to the relation, the electric field is negative gradient of electric potential. If the electric

potential is constant throughout given region of space, then change in electric potential , hence .

Q # 2. Suppose that you follow an electric field line due to a positive point charge. Do electric field