Energy and Momentum: Master the Fundamentals of Classical Mechanics

Question 1

What is the SI unit of momentum?

Accepted Answer

Kilogram meter per second

Answer

Joule

Answer

Newton-meter

Answer

Watt

Question 2

Which of the following statements describes the law of conservation of momentum?

Accepted Answer

The total momentum of a closed system remains constant.

Answer

The total energy of a closed system remains constant.

Answer

The total mass of a closed system remains constant.

Answer

The total charge of a closed system remains constant.

Question 3

Which of the following is a common misconception about the principles of energy and momentum?

Accepted Answer

Energy and momentum can be created or destroyed.

Answer

Energy and momentum are always conserved.

Answer

Energy and momentum are only conserved in closed systems.

Answer

Energy and momentum are only conserved in elastic collisions.

Question 4

Which of the following is a key mathematical equation used in the study of energy and momentum?

Accepted Answer

p = mv

Answer

E = mc^2

Answer

F = ma

Answer

W = Fd

Question 5

Which of the following is not considered a form of energy?

Accepted Answer

Mass

Answer

Kinetic energy

Answer

Potential energy

Answer

Heat

Question 6

The law of conservation of energy states that the total energy in an isolated system remains constant.

Accepted Answer

True

Answer

False

Question 7

What is the SI unit of momentum?

Accepted Answer

Kilogram-meter per second

Answer

Joule

Answer

Newton

Answer

Watt

Question 8

Which equation represents kinetic energy?

Accepted Answer

E = 1/2mv^2

Answer

E = mc^2

Answer

E = hv

Answer

E = mgh

Question 9

In a rocket engine, momentum is conserved by:

Accepted Answer

Expelling hot gases

Answer

Burning fuel

Answer

Compressing air

Answer

Using a propeller

Question 10

Determine the elastic potential energy (PE) stored in a spring with spring constant 'k' when stretched by a distance 'x'.

Accepted Answer

$\frac{1}{2}kx^2$

Answer

$kx$

Answer

$kx^3$

Answer

$\frac{1}{4}kx^2$

Question 11

The work done by a constant force on an object moving in the direction of the force is given by:

Accepted Answer

Force x Displacement

Answer

Force / Displacement

Answer

Displacement / Force

Answer

Force^2 x Displacement

Question 12

The momentum of an object is defined as:

Accepted Answer

Mass x Velocity

Answer

Velocity / Mass

Answer

Acceleration / Force

Answer

Force x Displacement

Question 13

In an elastic collision, which of the following quantities is conserved?

Accepted Answer

Both energy and momentum

Answer

Energy only

Answer

Momentum only

Answer

Neither energy nor momentum

Question 14

The law of conservation of momentum states that:

Accepted Answer

The total momentum of a closed system remains constant

Answer

The total kinetic energy of a closed system remains constant

Answer

The total potential energy of a closed system remains constant

Answer

The total mechanical energy of a closed system remains constant

Question 15

The impulse acting on an object is equal to:

Accepted Answer

Force x Time

Answer

Momentum x Velocity

Answer

Work / Time

Answer

Change in Kinetic Energy

Question 16

Which of the following is NOT a type of potential energy?

Accepted Answer

Kinetic potential energy

Answer

Gravitational potential energy

Answer

Elastic potential energy

Answer

Chemical potential energy

Question 17

Define the linear momentum of an object.

Accepted Answer

The product of its mass and velocity

Answer

The ratio of its mass to its velocity

Answer

The product of its force and acceleration

Answer

The difference between its kinetic and potential energy

Question 18

In an inelastic collision, what happens to the total energy of the system?

Accepted Answer

It decreases due to energy loss

Answer

It remains constant

Answer

It increases due to energy gain

Answer

It becomes zero

Question 19

Which of the following is not a form of energy?

Accepted Answer

Momentum

Answer

Kinetic energy

Answer

Potential energy

Answer

Electrical energy

Question 20

A ball is thrown vertically upward. At the peak of its trajectory, what is its velocity?

Accepted Answer

Zero

Answer

Equal to its initial velocity

Answer

Opposite to its initial velocity

Answer

Half of its initial velocity

Question 21

Which type of force is exemplified by friction?

Accepted Answer

Non-conservative force

Answer

Conservative force

Answer

Elastic force

Answer

Gravitational force

Question 22

What is the SI unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram