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## A body travels 100m in first 2 seconds and 104 in the next 4 second.how far will it gimove in the next four second if the acceleration is uniform?

A body travels 100m in first 2 seconds and 104 in the next 4 second.how far will it move in the next four seconds if the acceleration is uniform?

## A Problem from Motion

“Q. Velocity of a moving particle is given by v = t2 – 4. Find out:-
(i) Time at which velocity is zero.
(ii) Acceleration at which t= 1s
(iii) What type of motion uniform or non-uniform.”

Ans:

In the equation, put v=0 to find the time at which velocity equals zero

Differentiate the equation and then put t=1 to find acceleration at t=1s since a = dv/dt

The motion is non uniform as its velocity varies with time.

## A Few Problems from Kinematics

1. A body falling freely from rest has velocity v after it falls a height h . Calculate the distance it should fall down further for its velocity to become double
2. A particle in uniform acceleration in a straight line has a speed of v m/s at position x meter is given by √(25-16x). What is the acceleration of the particle

## Motion of a charge particle in an electric field – Numerical Problem

At t=0 a very small object with mass 0.400mg and charge +9.00μC is travelling at 125 m/s in the -x-direction. The charge is moving in a uniform electric field that is in the +y-direction and that has magnitude E= 895 N/C. The gravitational force on the particle can be neglected. How far is the particle from the origin at t= 7.99 ms.

Hint for solving the above problem:

displacement along X direction; x=-uxt=125 x 7.99/1000

Displacement along Y direction, y=0.5 ay t2

ay=qE/m

s=√(x2+y2)

Just substitute the values and get the answer

## Chemical effects of current

How much Ag can be deposited as uniform layer on a metallic vessel using 0.2 Ampere current passed through silver salt solution for 3 hours.(1 mol of Ag=108g)

## Speed Velocity and acceleration

Sir ir it true or false – “the speed of particle remains constant.this means that no unbalanced force acts on it.” (Purshkar  asks)

Answer: If velocity remains constant, then we can say that no unbalanced force acts on it.

If a body moves with uniform speed with its direction changing with time, as in the case of uniform circular motion, the net unbalanced force is not zero, as a net force is required to change the direction of motion

## Tested Physics Links to Learn the Laws of Motion online

Newton’s Laws of motion

First Law: Every body continues to be in its state of rest or state of uniform motion in a straight line unless an external force complels it to do so.

Second Law: The rate of change of momentum of a body is directly proportional to the net external force acting on it and the change in momentum takes place in the direction of motion

Third Law: To every action there is an equal and opposite reaction

The following links will help you learn the topic further and will provide an online resource for understanding the concepts related to it.

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