Newton's law question involving force and acceleration

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Homework Help Overview

The discussion revolves around a problem in classical mechanics, specifically applying Newton's laws of motion to a scenario involving force, mass, and acceleration. The original poster presents an equation for force as a function of time and seeks to derive an expression for velocity.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need for the original poster to demonstrate effort before receiving help. There are inquiries about the relevant equations that relate force, mass, and velocity, as well as a reminder of Newton's second law.

Discussion Status

The discussion is ongoing, with some participants emphasizing the importance of showing work before receiving assistance. There is a focus on clarifying the relationship between the given force expression and the principles of motion, but no consensus has been reached on how to proceed with the problem.

Contextual Notes

Participants note that the original poster has not provided sufficient effort in their initial inquiry, which is a requirement according to forum rules. The problem involves constants and expressions that need further exploration to connect them to the laws of motion.

Arsene11
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New poster has been reminded to always show their work when starting schoolwork threads
Homework Statement
A body of mass m = 1 kg moves along a straight line with speed v0, when it is
the action of a force in the same direction of motion. The magnitude of this force is given in terms of
of time t in seconds by the following expression:
F = b + ct^2

where b and which are constants with appropriate relationships for the term-owning unit of
force in newtons. Find an expression for the velocity v of the body as a function of time t.
Relevant Equations
F = b + ct^2
I have no idea what to do but the answer is V=V0+ bt +(ct^3)/3
 
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Hi Arsene11 and welcome to PF.

:welcome:
According to our forum rules you need to show some effort before receiving help. "I have no idea" is not enough of an effort.
 
Arsene11 said:
Relevant Equations:: F = b + ct^2
"Relevant equations" are standard equations that are likely to have some bearing on the problem, not arbitrary equations specific to the problem.
In this problem you have mass, force, time and velocity mentioned. What standard mechanics equations relate some of those?
 
What is Newton’s 2nd law?

Isn’t it

##F = m \frac{dv}{dt}##

Don’t you have a given expression for ##F##?

Set them equal and solve for ##v##
 
Arsene11 said:
Homework Statement:: A body of mass m = 1 kg moves along a straight line with speed v0, when it is
the action of a force in the same direction of motion. The magnitude of this force is given in terms of
of time t in seconds by the following expression:
F = b + ct^2

where b and which are constants with appropriate relationships for the term-owning unit of
force in Newtons. Find an expression for the velocity v of the body as a function of time t.
Relevant Equations:: F = b + ct^2

I have no idea what to do but the answer is V=V0+ bt +(ct^3)/3
@Arsene11 -- as you have been told, you must show your work before we can be of tutorial help. Please start a new thread and show your best efforts to start working on this problem. Thank you.
 

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