- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
When a constant force is applied to a body moving with constant acceleration, is the power of the force constant ? If not, how would force have to vary with speed for the power to be constant ?
Let the applied force is $F$ and velocity be $v$ of the body.
As known the expression for the power , $P=\frac{W}{t}$
When $W\rightarrow$work done
$t\rightarrow$ time
So, $P=\frac{W}{t}=\frac{F\times d}{t}$ [Because work $W=F\times d$]
Or $P=F\times\frac{d}{t}$
Or $P=F\times v$ [Because velocity $v=\frac{distance}{time}=\frac{d}{t}$]
Here we see that $P\propto F$ and $P\propto v$
And $F\propto\frac{1}{v}$
As given the applied force $F$ is constant and the acceleration $a$ is constant so the velocity will vary increasingly, and we find the applied force to be inversely proportional to the velocity and therefore to remain the power to be constant, applied force $F$ should be decreased.
Advertisements
To Continue Learning Please Login
Login with Google