Nature of Energy
Energy is
ability to do work
Energy is present wherever there is matter.
True or False
True
Electricity and Magnetism are 2 forms of same energy?
True or False
True.
Example for the law of conservation of energy.
Pendulum
Work is done when force makes something
move
The energy is broadly classififed in to
Potential and Kinetic Energy
The process of gaining & losing thermal energy is called
Heating & Cooling
Magnetic energy was used for
Navigation.
The quantity of motion is also called as
Momentum
Unit of power is
Watt
Kinetic energy is also known as
Energy in Motion
Potential energy is also known as
Stored Energy
What is Nuclear Fission & Fusion?
Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei.
Fusion is the process where two light nuclei combine together releasing vast amounts of energy.
The principle of First law of thermodynamics.
The total amount of energy entering the process quals the total of all forms of energy that exist at the end of the process.
When work is done energy gets transferred
From one form to another
List out the Potential Energies:
Chemical; Electric; Elastic & Gravitational Energy.
Natural source of Electrical Energy
Lightning, Eels
What is blue glow?
It happens when the polarized water molecules emit photon during nuclear reaction.
List out the possible energy emission from a car.
Chemical, Mechanical, Electrical, Thermal, Acoustic & Friction.
The least amount of force needed to begin a work.
Resistance force.
What is urban heat island effect
Differernce in temperature between urban and rural areas.
What is the potential energy of Isaac newtons 0.30 kg apple hanging from a tree at a height of 5m above the ground.
14.7 J
What is the kinetic energy of a 70kg sprinter running at 8m/s.
2240 J
Name the kinds of collision & state the most common form of collision.
Elastic, partially elastic and Inelastic Collisions. Partially elastic collision.
Express the efficiency of the machine with formula.
Efficiency = useful power output / total power input * 100