Question

compare the law conservation of momentum with the law of
conservation of energy. Comment on meaning of variables/equations
in each law including similarities between them.

Answer #1

**Solution:**

**Law of conservation of momentum**

It states that if no force is applied on a system then its momentum is conserved. let us take example of collsion, let two bodies of mass m1 and m2 are having initial velocities u1 and u2 after collision the velocities will be v1 and v2 Now as there is no external force applied, Hence

initial momentum = final momentum

**=> m1 * u1 + m2 * u2 = m1*v1 + m2 * v2**

Momentum is a vector quantity. So while applying law we use vector algebra

**Law of conservation of Energy**

According to this law , Energy can neither be created nor be destroyed but can be changed from one form to other. for example when an object is dropped from a height h then potential energy is converted to kinetic energy.

**P.E = K.E (using law of conservation of energy)(not
always true)**

Energy is scalar quantity So it can be added or subtracted easily.

Similarities & differences between momentum and energy
conservation?

The Bernoulli equation is a consequence of
A)
Conservation of energy
B) Conservation of momentum
C) Conservation of mass
D) Conservation of charge

What is the purpose of Conservation of linear momentum
experiment?
What is the theory of Conservation of linear momentum
experiment? ( Write a paragraph on elastic and inelastic collision.
Include related equations as well. (you will find them in lab
manual).)

Explain how the conservation of momentum is a
consequence of Newton's third law.

Using conservation of angular momentum, explain Kepler's second
law.

Explain how the laws of conservation of energy and conservation
of momentum were used to predict the existence and properties of
the neutrino.

Why are energy and momentum conservation needed to explain what
is observed?

The basic law for the derivation of the equations governing the
principle of conservation of linear momentum is:
Select one:
a. Newton's 3rd law.
b. Newton's 2nd law.
c. Bernoulli's equation.
d. The ideal gas law.

1.Why is conservation of momentum often the best or only way to
solve a puzzle?
-Because momentum is a vector and so it includes direction.
-momentum is a scalar so direction does not matter, only the
initial and final values.
-momentum comes in many forms and so is flexible for solving
many puzzles.
2. How does the work needed to get a car moving compare with its
kinetic energy? (Ignore friction.)
Less work is needed than the amount of energy....

Revisiting the ballistic pendulum. In lab we used both
conservation of momentum and conservation of energy to relate the
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a pendulum. Here we will study the parts of this problem in a bit
more detail.
(a) Briefly explain why momentum is conserved during the
collision of the projectile and the pendulum, but mechanical energy
is not conserved.
(b) Briefly explain why mechanical energy (kinetic plus
potential energy)...

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