A, b and c are the lengths of three sides of a triangle, then: *1 pointa. a+b>cb. a-b>cc. a+b=cd. a-b=c

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Energy of an isolated system is constant. It can neither be created nor be destroyed but it can be transformed from one type to another.

For example, when an object falls on the ground from a certain height, its kinetic energy is converted into other forms of energy such as sound energy, heat energy, light energy, etc.

Examples of Law of Conversation of Energy

When petroleum oil is burnt, chemical energy is converted into other form of energy specially light and heat energy.

In process of generation of hydroelectricity, water in reservoir is flown to rotate the turbine to generate electricity. In this process, potential energy (water in reservoir) is converted to kinetic energy (flowing water) to electrical energy.

When speaker which doesn't have battery is turned on, electrical energy is converted to sound energy.

Energy Conservation for a Free

Heating as a transfer of energy

thermal

heat

temperature

In the last chapter we looked at thermal systems. The thermal energy of an object is the amount of energy it has inside of it, in other words, its internal energy. In a thermal system, thermal energy is transferred from one object to another. Heat is the transfer of thermal energy from a system to its surroundings or from one object to another. This transfer of energy is from the object at a higher temperature to the object at a lower temperature.

It is very important to know that, in science, heat and temperature are not the same thing.

Heat is the transfer of thermal energy from a system to its surroundings or from one object to another as a result of a difference in temperature. Heat is measured in joules (J). This is because heat is a transfer of energy.

Temperature is a measure of how hot or cold a substance feels and it is measured in degrees Celsius (°C). Temperature is a measure of the average kinetic energy of the particles in an object or system. We use a thermometer to measure the temperature of an object or substance

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