Question

DISTINGUISH BETWEEN SPEED AND VELOCITY​

Answer 1

$\huge\mathfrak{\underline{\underline{\red {speed}}}}$

speed

Speed is defined as the rate of change of position of an object in any direction.

It is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude.

Speed Formula

$s = \frac{d}{t}$

Where,

• s is the speed in m.s^-1
• d is the distance traveled in m
• t is the time taken in s

Types of Speed

There are four types of speed and they are:

• Uniform speed
• Variable speed
• Average speed
• Instantaneous speed

Uniform speed:

A object is said to be in uniform speed when the object covers equal distance in equal time intervals.

Variable speed:

A object is said to be in variable speed when the object covers a different distance at equal intervals of times.

Average speed:

Average speed is defined as the uniform speed which is given by the ratio of total distance traveled by an object to the total time taken by the object.

Instantaneous speed:

When an object is moving with variable speed, then the speed of that object at any instant of time is known as instantaneous speed.

$\huge\mathfrak{\underline{\underline{\red {velocity}}}}$

The meaning of velocity of an object can be defined as the rate of change of the object’s position with respect to a frame of reference and time. It might sound complicated but velocity is basically speeding in a specific direction. It is a vector quantity, which means we need both magnitude (speed) and direction to define velocity. The SI unit of it is meter per second (ms^-1) if there is a change in magnitude or the direction in the velocity of a body the body is said to be accelerating.

Initial and Final Velocity

Initial velocity describes how fast an object travels when gravity first applies force on the object. On the other hand, the final velocity is a vector quantity that measures the speed and direction of a moving body after it has reached its maximum acceleration.

Finding the final velocity is simple with a few calculations and basic conceptual knowledge.

• Determine the object’s original velocity by dividing the time it took for the object to travel a given distance by the total distance. In the equation V = d/t, V is the velocity, d is the distance and t is the time.
• Determine the object’s acceleration by dividing the object’s mass by the force and multiply the answer by the time it took for it to accelerate. For example, if the object weighs 30 kg and has a force of 15 N applied to it, then he acceleration would be 4 m/s.
• Add the quantity obtained from Step 1 and Step 2 to obtain the final velocity. For example, if your initial velocity was 3 m/s and your object acceleration is 4 m/s, your final velocity is 7 m/s (3 + 4 = 7).