Newton's Laws of Motion

What does Newton's First Law of Motion state?

• An object at rest will remain at rest unless acted upon by an unbalanced force.

• An object will always move in a straight line.

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

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

Answer explanation

Newton's First Law states that an object at rest will stay at rest unless an unbalanced force acts on it. This highlights the concept of inertia, which is the tendency of objects to resist changes in their state of motion.

Which formula represents Newton's Second Law of Motion?

• F = ma

• E = mc^2

• F = mv^2

• P = mv

Answer explanation

Newton's Second Law of Motion is represented by the formula F = ma, where F is the force, m is the mass, and a is the acceleration. This formula shows how force is directly proportional to mass and acceleration.

According to Newton's Third Law of Motion, what happens when one object exerts a force on another?

• The second object exerts an equal force back on the first.

• The second object moves in the opposite direction.

• The first object stops moving.

• The second object exerts a greater force back on the first.

Answer explanation

According to Newton's Third Law of Motion, when one object exerts a force on another, the second object exerts an equal force back on the first. This means forces are always equal and opposite.

What is the relationship between force, mass, and acceleration according to Newton's Second Law?

• Acceleration is directly proportional to force and inversely proportional to mass.

• Acceleration is inversely proportional to force and directly proportional to mass.

• Force is directly proportional to mass and inversely proportional to acceleration.

• Force is inversely proportional to mass and directly proportional to acceleration.

Answer explanation

According to Newton's Second Law, acceleration (a) is directly proportional to the net force (F) acting on an object and inversely proportional to its mass (m), expressed as a = F/m. Thus, the correct choice is that acceleration is directly proportional to force and inversely proportional to mass.

What does Newton's First Law describe?

• The concept of inertia

• The relationship between force and mass

• The action-reaction principle

• The speed of light

Answer explanation

Newton's First Law describes the concept of inertia, which states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by a net external force.

Which of Newton's Laws relates force, mass, and acceleration?

• First Law

• Second Law

• Third Law

• Fourth Law

Answer explanation

Newton's Second Law states that force equals mass times acceleration (F=ma). This law directly relates the three concepts, making it the correct choice for the question.

What principle does Newton's Third Law illustrate?

• Inertia

• Gravity

• Action-reaction

• Conservation of energy

Answer explanation

Newton's Third Law states that for every action, there is an equal and opposite reaction. This illustrates the principle of action-reaction, where forces always occur in pairs.

According to the text, what can studying Newton's Laws help us appreciate?

• The beauty of mathematics

• The forces that govern our everyday lives

• The complexity of chemical reactions

• The mysteries of the universe

Answer explanation

Studying Newton's Laws helps us appreciate the forces that govern our everyday lives, as they explain how objects move and interact, making these fundamental principles relevant to our daily experiences.

What is the unit of force in the International System of Units (SI)?

• Newton

• Watt

• Pascal

• Joule

Answer explanation

The unit of force in the International System of Units (SI) is the Newton. It is defined as the force required to accelerate a one-kilogram mass by one meter per second squared.

Which of the following is an example of a non-contact force?

• Normal force

• Magnetic force

• Friction

• Tension

Answer explanation

The magnetic force is a non-contact force, as it can act at a distance without physical contact. In contrast, normal force, friction, and tension require direct contact between objects.