What is conservation of mass and energy and give example

Attach is an article published at AppraisalNewsCast, which explain 15 different ways to conserve energy in your home.

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Kinetic energy is energy possessed by a body by virtue of its movement. Potential energy is the energy possessed by a body by virtue of its position or state.


1: a rock sitting on cliff, read to fall.
2: a rock falling now is Kinetic.
3: a car moving is kinetic.
me swinging a rope is kinetic.

the earth flying around the sun, is kinetic.

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1. The law of conservation of mass, or principle of mass conservation, states that for any system closed to all transfers of matter and energy (both of which have mass), the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed."

In other words matter cannot be created or destroyed, only converted, into heat, energy, work, or other matter.

If your system is not closed (it probably isn't) and mass does not remain equal, then it is most likely that energy was gained or lost by the system. This most likely was in the form of heat.

You will need a pretty good scales to detect this though, as a tiny amount of matter = a huge amount of energy

When giving physical quantities you cannot omit the units. (an angle of 10 what). You cannot solve the problem fully because you are missing the length of the pendulum.
You cannot use any kinematic relations because the expression of the period depends on the assumption that angles of rotation remain small.
You will have to use the energy conservation principle. Assuming that the mass was released with 0 initial kinetic energy, the kinetic energy at the lower point (angle 10 degrees) is equal to the change in potential energy between the release point and the point where the mass is.
(1/2)mv^2=delta Ep= Ep(30 deg)-Ep(10 deg)
Once you calculate the potential energy (see screen capture) difference you will see that it is proportional to m*g, so the mass will cancel out.
Your turn: Calculate the potential energy difference between the positions at 30 deg and 10 deg, equate the result with the kinetic energy and solve for v^2, and hence for v the tangential velocity.

The first law of thermodynamics distinguishes between two kinds of physical process, namely energy transfer as work, and energy transfer as heat. It tells how this shows the existence of a mathematical quantity called the internal energy of a system. The internal energy obeys the principle of conservation of energy but work and heat are not defined as separately conserved quantities. Equivalently, the first law of thermodynamics states that perpetual motion machines of the first kind are impossible.

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(4.5 US quarts)

Hi,
The law of conservation of mass and energy states that mass and energy can neighther be created nor destroyed however it can be changed into one form to another.