Physics 9th Class Chapter 1 Lecture 2 – Scalar and Vector – Acceleration

Short Questions:

Q1: What is the difference between Scalar and Vector? Give Examples also.

Ans: A scalar quantity is described by its magnitude only—for example, mass, length, time, speed, volume, work, and energy.

A vector quantity is described completely by magnitude and direction.  For example, Force on the North side.

Q2: What is the difference between Position, Distance, and Displacement?

Ans: The location of a place or a point with respect to some reference point called the origin or Position.

The length of a path between two points is called the distance between those points is known as Distance.

Displacement is the shortest distance between two points which has magnitude and direction.

Q3: What is the difference between Velocity and Speed? with formula.

Ans: The distance covered by an object in unit time is called its speed.

Formula: Speed = distance/time

The rate of displacement of a body is called its velocity.

Formula: Velocity = displacement/time

Q4: What is the difference between Uniform Speed and Uniform Velocity?

Ans: A body has uniform speed if it covers equal distances in equal intervals of time however short the interval may be.

A body has uniform velocity if it covers equal displacement in equal intervals of time however short the interval may be.

Q5: What are Acceleration and Uniform Acceleration?

Ans: Acceleration is defined as the rate of change of velocity of a body.

A body has uniform acceleration if it has equal changes in velocity in equal intervals of time however short the interval may be.

Formula: Acceleration = change in velocity/time