Question

Write about acceleration.


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Types ☑️


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Answer 1

Answer:

When the velocity of an object changes it is said to be accelerating. Acceleration is the rate of change of velocity with time.

In everyday English, the word acceleration is often used to describe a state of increasing speed. For many Americans, their only experience with acceleration comes from car ads. When a commercial shouts "zero to sixty in six point seven seconds" what they're saying here is that this particular car takes 6.7 s to reach a speed of 60 mph starting from a complete stop. This example illustrates acceleration as it is commonly understood, but acceleration in physics is much more than just increasing speed.

Any change in the velocity of an object results in an acceleration: increasing speed (what people usually mean when they say acceleration), decreasing speed (also called deceleration or retardation), or changing direction (called centripetal acceleration). Yes, that's right, a change in the direction of motion results in an acceleration even if the moving object neither sped up nor slowed down. That's because acceleration depends on the change in velocity and velocity is a vector quantity — one with both magnitude and direction. Thus, a falling apple accelerates, a car stopping at a traffic light accelerates, and an orbiting planet accelerates. Acceleration occurs anytime an object's speed increases or decreases, or it changes direction.

Much like velocity, there are two kinds of acceleration: average and instantaneous. Average acceleration is determined over a "long" time interval. The word long in this context means finite — something with a beginning and an end. The velocity at the beginning of this interval is called the initial velocity, represented by the symbol v0 (vee nought), and the velocity at the end is called the final velocity, represented by the symbol v (vee). Average acceleration is a quantity calculated from two velocity measurements.

Answer 2

$\huge\bigstar\underline\blue{Acceleration}$

This particular physical quantity provides information about the change in velocity of an object with respect to time. By this we can gain the idea about more or less velocity of an object. Also velocity of one object can be compared with each other.

So,

Acceleration is the rate of change of velocity.

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Formula :

Acceleration = change in velocity / time

a = (final velocity - initial velocity)/time

Let any object moves in such a way that its velocity changes from initial value ( u ), to final value ( v ) in time ( t ).

Then,

a =( v - u )/t

where,

v is final velocity

u is initial velocity

t is time

and a is Acceleration.

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Let u = 0 ( if initial velocity is zero then the body is at rest )

Then,

a = (v-0)/t

a = v/t

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S.I unit of Acceleration :

It depend upon the unit of velocity and time.

a = (m/s)/s or m/s² or ms-¹

Hence, The S.I unit of Acceleration is meter per second square.

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Types of acceleration :

Acceleration is of three types :

• positive acceleration
• negative acceleration
• zero acceleration

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What is positive acceleration ?

→ By virtue of this, the velocity of an object increases with time. In other words, it is in the same direction of velocity.

What is negative acceleration ?

→ By virtue of this, the velocity of an object decreases with the time. In other words, it is in the opposite direction of velocity.

What is zero acceleration ?

→ By virtue of this, the velocity of an object is zero show that the object is at rest and it cant be accelerated.

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