Energy

Question 1

Define Energy & its SI unit

Answer 1

-Energy is the ability or capacity to do work
- SI unit= Joule, J

Question 2

Mechanical Energy (Types of Energy)

Answer 2

Mechanical Energy=
Potential Energy + Kinetic Energy
Em = Ep + Ek

Question 3

Potential Energy (Types of Energy)

Answer 3

• Potential Energy is the energy a body possesses due to its state or position
• Gravitational Potential Energy is the energy a body possesses due to its height above the Earth’s surface
  When we calculate potential energy we actually calculate Gravitational pe.
• Ep= m(mass) g(gravity) h(height)
• ^ (change in potential energy)Ep=
  m g ^h(change in height)
  Therefore in Ep is dependent on change in height
• If the body has no height above Earth’s surface then it has no Ep
• If h=0, Ep=0

Question 4

Kinetic Energy (Types of Energy)

Answer 4

Kinetic Energy is the energy a body processes due to its motion
-Ek= 1/2 m(mass) v(velocity squared)
- Ek is dependent on the motion
Therefore velocity of the body

Question 5

Electromagnetic Energy

Answer 5

The energy of radio waves, microwaves, infrared waves, light waves, ultraviolet waves, x-waves & gamma waves

Question 6

Chemical Energy

Answer 6

The energy stored in the bonds of chemical compounds

Question 7

Sound Energy

Answer 7

The energy transferred by vibrating particles of a sound wave

Question 8

Thermal Energy

Answer 8

The energy due to the motion of the particles of a body

Question 9

Heat Energy

Answer 9

Thermal energy due to the process of being transferred from one point to a next, due to the temperature difference between them

Question 10

Electrical Energy

Answer 10

The energy resulting from charged particles being in electric fields

Question 11

Nuclear Potential Energy

Answer 11

The energy binding the particles of the nucleus of an atom

Question 12

Law of Conservation of Energy

Answer 12

Energy can neither be created nor destroyed but can be transferred from one form to another