# 90 Multiple Choice Questions on Laws of Motion with Answers

• April 10, 2021
• Science

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 about 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, teacher 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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