# 90 Multiple Choice Questions on Laws of Motion MCQ Answers

Newton’s laws of motion are three physical laws that, collectively, laid the inspiration for classical mechanics. Multiple-choice questions on laws of motion with answers can give a good conception of the law as well as its utility.

They describe the connection between a physique and the forces performing upon it, and its motion in response to these forces where these multiple-choice questions on laws of motion with answers will be able to multiply their usefulness.

More exactly, the primary regulation defines the power qualitatively, the second regulation affords a quantitative measure of the power, and the third asserts {that a} single remoted power does not exist.

These three legal guidelines have been expressed in a number of methods, over practically three centuries. Multiple-choice questions on laws of motion with answers are helpful to discuss with friends, and teachers, and fit for any examination.

Newton’s first law states that-

Every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

This is normally taken as the definition of inertia. The key point here is that if there is no net force acting on an object (if all the external forces cancel each other out) then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force is applied, the velocity will change because of the force.

The second law states that-

In an inertial frame of reference, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. (It is assumed here that the mass m is constant

The law defines a force to be equal to a change in momentum (mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the “changes” expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object’s mass and its acceleration a:

F = m * a

For an externally applied force, the change in velocity depends on the mass of the object. A force will cause a change in velocity; and likewise, a change in velocity will generate a force. The equation works both ways.

The third law states that

for every action (force) in nature there is an equal and opposite reaction.

In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A. Notice that the forces are exerted on different objects. The third law can be used to explain the generation of lift by a wing and the production of thrust by a jet engine.

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#### 90. His dog set Newton's laboratory on fire, ruining 20 years of research.

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055-science

Newton’s laws of motion are three assertions that describe the relationships between the forces acting on a body and its motion, and they constitute the cornerstone of classical mechanics. They were first started by English scientist and mathematician Isaac Newton.

Newton’s first law asserts that if a body is at rest or traveling in a straight path at a constant speed, it will remain at rest or continue to move in a straight line at a constant speed until acted upon by a force. In fact, in classical Newtonian mechanics, there is no significant difference between rest and uniform motion in a straight line; they can be considered the same state of motion seen by two observers, one moving at the same speed as the particle and the other moving at a constant velocity with respect to the particle. The law of inertia is the name given to this concept.

Galileo Galilei initially proposed the law of inertia for horizontal motion on Earth, and RenÃ© Descartes later expanded it. The concept of inertia is the starting point and fundamental assumption of classical mechanics, yet it is not immediately apparent to the untrained eye. Objects that are not being pushed tend to come to a halt in Aristotelian mechanics and in everyday life. Galileo derived the law of inertia from his studies with balls rolling down inclined surfaces.

The second law of Newton is a quantitative explanation of the effects that a force can have on a body’s motion. It asserts that the force applied on a body equals the time rate of change of its momentum in both magnitude and direction. The product of a body’s mass and velocity determine its momentum. Momentum is a vector quantity with both magnitude and direction, similar to velocity. A force acting on a body can affect the magnitude, direction, or both of the momentum’s components. One of the most essential laws in physics is Newton’s second law. F = ma may be written for a body with a constant mass m, where F (force) and an (acceleration) are both vector values.

When a body is subjected to a net force, it accelerates according to the equation. A body that is not accelerated, on the other hand, has no net force acting on it.

When two bodies contact, Newton’s third law states that they apply forces to each other that are equal in magnitude and opposing in direction. The law of action and response is another name for the third law. This law is useful in assessing static equilibrium situations in which all forces are balanced, but it also applies to things moving in a uniform or rapid motion. The dynamics it depicts are genuine, not just accounting gimmicks. A book on a table, for example, exerts a downward force equal to its weight on the table. The third law states that the table exerts an equal and opposite force on the object.

The weight of the book causes the table to bend somewhat, causing it to press back on the book like a coiled spring.
According to the second law, when a body is subjected to a net force, it experiences accelerated motion. The body does not accelerate and is considered to be in equilibrium if there is no net force acting on it, either because there are no forces at all or because all forces are exactly balanced by counter forces. A body that is not accelerated, on the other hand, may be assumed to have no net force acting on it.

### Newton’s laws have an impact

Newton’s laws were initially published in Philosophiae Naturalis Principia Mathematica (1687), which is often known as the Principia. Nicolaus Copernicus proposed in 1543 that the Sun, rather than the Earth, be the center of the universe. In the years that followed, Galileo, Johannes Kepler, and Descartes lay the groundwork for a new science that would both replace the ancient Greeks’ Aristotelian worldview and explain the workings of a heliocentric cosmos. That new science was founded by Newton in the Principia. He created his three principles to explain why the planets’ orbits are ellipses rather than circles, which he did, but it turned out that he explained a lot more. The Scientific Revolution encompasses the events that occurred between Copernicus and Newton.

Quantum mechanics and relativity supplanted Newton’s principles as the most fundamental rules of physics in the twentieth century. Despite this, Newton’s laws continue to accurately describe nature, with the exception of very tiny entities such as electrons or those flying at near-light speeds. For bigger things or slower-moving bodies, quantum mechanics and relativity reduce to Newton’s rules.

## Background

The three laws of motion of Sir Isaac Newton explain the motion of enormous masses and how they interact. While Newton’s principles may appear clear to us now, they were revolutionary more than three centuries ago.

Newton was one of history’s most significant scientists. His theories laid the groundwork for current physics. He drew on the ideas of earlier scientists such as Galileo and Aristotle and was able to verify several notions that had previously just been theories. He was a mathematician who created calculus after studying optics, astronomy, and mathematics. (At around the same time, German mathematician Gottfried Leibniz is credited with independently creating it.)

Newton is likely best recognized for his research on gravity and planet motion. Newton formalized the description of how massive bodies move under the influence of external forces in his seminal work “Philosophiae Naturalis Principia Mathematica” (Mathematical Principles of Natural Philosophy) in 1687, prompted by astronomer Edmond Halley after admitting he had lost his proof of elliptical orbits a few years prior.

Newton simplified his handling of enormous entities by treating them as mathematical points with no size or rotation while creating his three scientific laws. This allowed him to overlook things like friction, air resistance, temperature, and material qualities, and focus on phenomena that can only be represented in terms of mass, length, and time. As a result, the three laws cannot be utilized to properly explain the behavior of big stiff or deformable objects, although they do offer adequate approximations in many circumstances.

Newton’s rules apply to the motion of heavy masses in an inertial reference frame, commonly dubbed a Newtonian reference frame, although Newton himself never specified such a reference frame. An inertial reference frame is a three-dimensional coordinate system that is either fixed or moving in a uniform linear motion, i.e. it is neither spinning nor accelerating. Three simple rules might be used to define motion inside such an inertial reference frame, he discovered.

“A body at rest will remain at rest, and a body in motion will continue in motion until it is acted with by an external force,” asserts Newton’s First Law of Motion. This simply implies that things cannot begin, end, or change course on their own. A force operating on them from the outside is required to bring about such a shift. Inertia is a term used to describe the ability of huge masses to resist changes in their state of motion.

When a huge body is operated upon by an external force, the Second Law of Motion defines what happens. “The force acting on an item is equal to that object’s mass times its acceleration,” it says. This is expressed as F = ma, where F stands for force, m for mass, and a for acceleration. Force and acceleration are vector quantities, which means they have both magnitude and direction, as shown by the bold letters. The force might be a single force or the vector sum of several forces, which is the net force when all of the forces are added together.

When a constant force occurs on a heavy body, it causes it to accelerate at a constant rate, changing its velocity. A force applied to an item at rest causes it to accelerate in the direction of the force in the simplest case. If the object is already moving, or if the scenario is seen through the eyes of a moving reference frame, the body may appear to speed up, slow down, or change direction depending on the direction of the force and the relative motions of the object and reference frame.

“For every action, there is an equal and opposite response,” asserts the Third Law of Motion. When a body exerts a force on another body, this law defines what happens. Because forces always occur in pairs, when one body pushes against another, the other body pushes back with equal force. When you push a cart, the cart pushes back against you; when you pull on a rope, the rope pushes back against you; when gravity pulls you down against the ground, the ground pushes up against your feet; and when a rocket ignites its fuel behind it, the expanding exhaust gas pushes on the rocket, accelerating it.

If one item is massively more massive than the other, especially if the first object is tethered to the Earth, the second object receives practically all of the acceleration, and the first object’s acceleration may be safely ignored. For example, if you threw a baseball to the west, you wouldn’t have to think about the fact that you caused the Earth’s rotation to speed up somewhat while the ball was in the air. If you were standing on roller skates and hurled a bowling ball forward, you would begin to go backward at a considerable rate.

Over the last three centuries, innumerable tests have confirmed the three principles, and they are still extensively employed to explain the types of objects and speeds we experience in everyday life. They represent the cornerstone of what is now known as classical mechanics, which is the study of substantial things that are bigger than quantum physics’ very tiny scales and move at slower speeds than relativistic mechanics’ very high speeds.