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Laws and Forces in Motion Quiz

#1

Which of the following is an example of Newton's first law of motion?

An object at rest stays at rest unless acted upon by an unbalanced force.
Explanation

Objects remain stationary or in uniform motion unless acted upon by an external force.

#2

What is the SI unit of force?

Newton
Explanation

Force is measured in Newtons (N) in the International System of Units (SI).

#3

What is inertia?

The tendency of an object to resist a change in motion.
Explanation

Inertia is the property of objects to resist changes in their state of motion.

#4

Which of the following is NOT a type of friction?

Centrifugal friction
Explanation

Centrifugal friction is not a recognized type of friction in physics.

#5

Which of the following is NOT a fundamental force in nature?

Thermal force
Explanation

Thermal force is not considered one of the fundamental forces in physics.

#6

What does the law of universal gravitation state?

Every object in the universe is attracted to every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Explanation

Gravity between objects is determined by mass and distance, as per the law of universal gravitation.

#7

Which of the following is a measure of the resistance of an object to changes in its rotational motion?

Moment of inertia
Explanation

Moment of inertia quantifies an object's resistance to changes in rotational motion.

#8

Which of the following equations represents Newton's second law of motion?

F = m * a
Explanation

Force (F) equals mass (m) times acceleration (a) as per Newton's second law.

#9

A 10 kg object experiences a net force of 20 N. What is its acceleration?

2 m/s^2
Explanation

Acceleration is calculated by dividing the net force by the mass (a = F/m).

#10

What is the momentum of a 2 kg object moving at 3 m/s?

6 kg m/s
Explanation

Momentum is the product of an object's mass and velocity (p = m * v).

#11

Which of the following statements best describes an elastic collision?

Total mechanical energy is conserved.
Explanation

In elastic collisions, total mechanical energy, including kinetic energy, is conserved.

#12

What is the weight of a 50 kg object on Earth? (Acceleration due to gravity on Earth is approximately 9.8 m/s²)

490 N
Explanation

Weight is the force exerted on an object due to gravity (Weight = mass * acceleration due to gravity).

#13

What is the torque experienced by a wrench when applying a force of 20 N at a distance of 0.5 meters from the pivot point?

40 Nm
Explanation

Torque is the product of force and the perpendicular distance from the pivot point (Torque = force * distance).

#14

What happens to the gravitational force between two objects if the distance between them doubles?

It quarters.
Explanation

Gravitational force decreases to one-fourth when the distance between objects is doubled.

#15

Which law of motion explains the propulsion of a rocket?

Newton's second law
Explanation

The motion of a rocket is explained by Newton's second law, linking force, mass, and acceleration.

#16

What is the centripetal force?

The force that causes an object to move in a circular path.
Explanation

Centripetal force acts toward the center of rotation, keeping an object in circular motion.

#17

Which of the following represents Hooke's Law?

F = kx
Explanation

Hooke's Law describes the relationship between force, spring constant, and displacement in a spring.

#18

Which of the following is NOT a type of collision?

Unilateral collision
Explanation

Unilateral collision is not a recognized type of collision in physics.

#19

What is the buoyant force experienced by an object submerged in a fluid?

Equal to the weight of the fluid displaced by the object
Explanation

Buoyant force is equal to the weight of the fluid displaced by a submerged object.

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