Umamahadev – Page 2 – SarkariResult.day

A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational Force?Explain your answer.

January 21, 2026 by Umamahadev

Here we have to find the work done only by gravitational force. So when an object is moved in horizontal position from Point A to Point B then displacement occurs and gravitation force is acting always downward directing along the earth on the object. So the angle formed between force of gravity and displacement is … Read more

Certain force acting on a 20 kg mass changes its velocity from 5 m s–1 to 2 m s–1. Calculate the work done by the force.

January 21, 2026 by Umamahadev

Here an object has mass of 20 kg which is changing it’s velocity from 5m/s to 2m/s. We know that work done is also equal to change in kinetic Energy. work Done = Change in kinetic Energy = Final kinetic Energy – Initial Kinetic Energy = W = ½ m v² − ½ mu² Mass … Read more

A battery lights a bulb. Describe the energy changes involved in the process.

January 21, 2026 by Umamahadev

Here, Inside the battery there is a filling of chemical when we connect battery with a bulb through wire. A chemical reaction takes place inside the battery. This chemical reaction produce electric charges this electric charges flow throw wire then goes in to bulb then bulb produce heat and that sufficent heat produce light. Then … Read more

An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

January 21, 2026 by Umamahadev

Here, question says we have to find the work done by only force of gravity. ( Gravitation Force ). Here students you can imagine that when an object is thrown in curved path then force is acting by gravitation towards the earth and displacement is going in horizontal position so angle between force and displacement … Read more

Look at the activites listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’

January 21, 2026January 20, 2026 by Umamahadev

(a) Suma is swimming in a pond. Here Suma is swimming so you can say that she is travelling some distance , because while swimming a displacement is occurs and a force is also needed to move forward which is suma done by his hands . so force and displacement occurs hence we can say … Read more