# 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