Dynamics: Master the Forces and Motion in Mechanical Principles

Question 1

As per Newton's Third Law of Motion, what is a key feature of the interaction forces between two objects?

Accepted Answer

They act on different objects.

Answer

They have different strengths.

Answer

They act in perpendicular directions.

Answer

They cause the objects to move in the same direction.

Question 2

According to Newton's First Law of Motion, an object at rest will remain at rest unless acted upon by an external unbalanced force.

Accepted Answer

True

Answer

False

Question 3

The principle of conservation of energy states that the total energy of an isolated system remains constant throughout the process.

Accepted Answer

True

Answer

False

Question 4

Which of the following factors influence the acceleration of an object?

Accepted Answer

Both mass and force

Answer

Mass

Answer

Force

Question 5

An object moving in a circular path experiences a force called:

Accepted Answer

Centripetal force

Answer

Centrifugal force

Answer

Coriolis force

Question 6

The work done by a force is equal to the product of the force and:

Accepted Answer

Displacement

Answer

Velocity

Answer

Acceleration

Question 7

Which of the following is a vector quantity?

Accepted Answer

Displacement

Answer

Speed

Answer

Temperature

Question 8

In a mechanical system, which condition occurs when the net force acting on an object is zero?

Accepted Answer

Static equilibrium

Answer

Dynamic equilibrium

Answer

Unstable equilibrium

Question 9

Newton's first law of motion states that:

Accepted Answer

An object at rest stays at rest, and an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force.

Answer

The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass.

Answer

For every action, there is an equal and opposite reaction.

Answer

Momentum is conserved in a closed system.

Question 10

The unit of momentum is:

Accepted Answer

Kilogram meter per second

Answer

Newton

Answer

Joule

Answer

Watt

Question 11

According to Newton's second law of motion, the relationship between force, mass, and acceleration is:

Accepted Answer

F = ma

Answer

F = mv

Answer

F = 1/2mv^2

Answer

F = mg

Question 12

The principle of conservation of energy states that:

Accepted Answer

Energy can neither be created nor destroyed, only transferred or transformed.

Answer

Momentum is conserved in a closed system.

Answer

An object at rest remains at rest, unless acted upon by an external force.

Answer

The acceleration of an object is directly proportional to the net force acting on the object.

Question 13

A closed system is one in which:

Accepted Answer

No energy or matter can enter or leave the system.

Answer

Only energy can enter the system.

Answer

Only matter can enter the system.

Answer

Both energy and matter can enter the system.

Question 14

The formula for kinetic energy is:

Accepted Answer

1/2mv^2

Answer

F = ma

Answer

P = W/t

Answer

E = mc^2

Question 15

The formula for gravitational potential energy is:

Accepted Answer

mgh

Answer

1/2mv^2

Answer

F = ma

Answer

E = mc^2

Question 16

Friction is an example of a:

Accepted Answer

Non-conservative force

Answer

Conservative force

Answer

Fundamental force

Answer

Contact force

Question 17

According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its:

Accepted Answer

Mass

Answer

Displacement

Answer

Momentum

Answer

Velocity

Question 18

An object with a mass of 5 kg is moving with a velocity of 3 m/s. Calculate its momentum.

Accepted Answer

15 kg m/s

Answer

3 kg m/s

Answer

5 kg m/s

Question 19

Which of the following is NOT a type of energy associated with an object's motion?

Accepted Answer

Chemical energy

Answer

Gravitational energy

Answer

Thermal energy

Answer

Potential energy

Question 20

A car travels a distance of 80 km in 1.5 hours. Calculate its average velocity.

Accepted Answer

53.3 km/h

Answer

40 km/h

Answer

120 km/h

Answer

80 km/h

Question 21

A body is in equilibrium when the sum of all forces acting on it is:

Accepted Answer

Zero

Answer

Negative

Answer

Positive

Question 22

Which of the following is a vector quantity?

Accepted Answer

Velocity

Answer

Time

Answer

Temperature

Answer

Energy

Question 23

Which of the following is a fundamental unit in the SI system?

Accepted Answer

Meter

Answer

Degree Celsius

Answer

Newton

Answer

Joule