Energy exist many forms
like mechanical, sound, light, electrical, chemical, heat, nuclear, solar.
Energy possessed by a body due to its position is known as potential
energy.
The energy possessed by a body because of motion is called kinetic
energy.
Heat is a form of kinetic energy.
Light is the form of kinetic
energy.
The main source of energy is sun. Sound is a form of energy. Light can travel in vacuum with a speed of about 3×108
ms-1.
Our ears can detect sound in the frequency range of 20Hz to 20000Hz. Sound can travel through solid, liquid, and gases, but it cannot
travel through vacuum.
The loss of energy in any system is called dissipation
of energy. Renewable energy is energy generated from natural resources
sunlight, wind, rain
The main source of energy is sun.
Sound is a form of energy.
Light can travel in vacuum with a speed of about 3×108
ms-1.
Our ears can detect sound in the frequency range of 20Hz to 20000Hz.
Sound can travel through solid, liquid, and gases, but it cannot
travel through vacuum.
The loss of energy in any system is called dissipation
of energy.
Renewable energy is energy generated from natural resources
sunlight, wind, rain
Non- renewable energy
resource like oil, natural gases, and coal.
Age group and daily energy
need …….
a)(1-3 years ……..1200 k cal) b) (4-6 years……...1600 k cal)
c) (7-10
years…….2000 k cal) d) (11-12 years…… 2500 k cal)
The main source of energy is …………
a) Sun
b) Water
c) Wind
d) Magnet
Which of the following is a type of energy stored in an object due to its position? NTS PST15/12/2019 (11:30) a) kinetic energy b) potential energy c) heat energy d) chemical energy
