Motion in a Plane-Class 11 Physics CBSE Notes

What is Motion in a Plane?

Motion in a plane is the motion in 2 dimensions, for instance, projectile motion, circular motion and so on. The reference to analyze a 2 Dimensional motion will be the origin with two coordinate axes i.e., X and Y.

What are Scalar Quantities?

Scalar quantities are those physical qualities that can be specified completely by their magnitude alone. Examples of scalar quantities are mass, density, temperature, length, work, speed, etc.

What are Vector Quantities?

Vector quantities are specified by both magnitude and direction. Examples of vector quantities are displacement, acceleration, momentum, velocity, torque, force, etc. The direction of any vector quantity is specified by a unit vector. Vectors lying in the same or parallel to the same plane are called coplanar vectors.

Example of Motion in a Plane.

Projectile motion is one of the most common examples of motion in a plane. When an object moves in a circular path at a constant speed, then the object is said to be in a uniform circular motion.

Time Period

The time period of uniform circular motion is the time taken by an object to complete one complete revolution in its circular path. To maintain an object in its uniform circular motion, a radially inward acceleration must be maintained continuously, it is called centripetal acceleration.

Important Questions

  1. State, for each of the following physical quantities, if it is a scalar or a vector:

Volume, mass, speed, acceleration, density, number of moles, velocity, angular frequency, displacement, and angular velocity.

  1. Pick out the two scalar quantities in the following list:

Force, angular momentum, work, current, linear momentum, electric field, average velocity, magnetic moment, relative velocity.

  1. Pick out the only vector quantity in the following list:

Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction, and charge.

Frequently Asked Questions on CBSE Class 11 Physics Notes Chapter Motion in a Plane

Q1

What does scalar quantity mean?

Scalar quantities are quantities that are described only by magnitude. They do not have a direction of action.

Q2

What does vector quantity mean?

A vector quantity is a quantity that has both magnitude and direction.

Q3

What is meant by ‘Non-uniform’ motion?

An object covers an unequal distance which is equal in intervals of time, then the object is said to have non-uniform motion.

Er. Neeraj K.Anand is a freelance mentor and writer who specializes in Engineering & Science subjects. Neeraj Anand received a B.Tech degree in Electronics and Communication Engineering from N.I.T Warangal & M.Tech Post Graduation from IETE, New Delhi. He has over 30 years of teaching experience and serves as the Head of Department of ANAND CLASSES. He concentrated all his energy and experiences in academics and subsequently grew up as one of the best mentors in the country for students aspiring for success in competitive examinations. In parallel, he started a Technical Publication "ANAND TECHNICAL PUBLISHERS" in 2002 and Educational Newspaper "NATIONAL EDUCATION NEWS" in 2014 at Jalandhar. Now he is a Director of leading publication "ANAND TECHNICAL PUBLISHERS", "ANAND CLASSES" and "NATIONAL EDUCATION NEWS". He has published more than hundred books in the field of Physics, Mathematics, Computers and Information Technology. Besides this he has written many books to help students prepare for IIT-JEE and AIPMT entrance exams. He is an executive member of the IEEE (Institute of Electrical & Electronics Engineers. USA) and honorary member of many Indian scientific societies such as Institution of Electronics & Telecommunication Engineers, Aeronautical Society of India, Bioinformatics Institute of India, Institution of Engineers. He has got award from American Biographical Institute Board of International Research in the year 2005.