Solving for v(t) & x(t) in a Region of Resistive Force

Click For Summary
SUMMARY

The discussion focuses on solving for the velocity v(t) and position x(t) of an object experiencing a resistive force proportional to the square of its velocity, specifically -bv². The key equation derived is m dv/dt = -bv², indicating that the acceleration is dependent on the velocity. To find v(t), one must solve this differential equation, which is essential for understanding the object's motion in the resistive region.

PREREQUISITES
  • Understanding of Newton's second law (F = ma)
  • Familiarity with differential equations
  • Knowledge of resistive forces in physics
  • Basic calculus concepts, particularly integration and differentiation
NEXT STEPS
  • Study methods for solving first-order differential equations
  • Learn about the integration techniques for velocity and acceleration equations
  • Explore the implications of resistive forces on motion in physics
  • Investigate numerical methods for approximating solutions to differential equations
USEFUL FOR

Students in physics, particularly those studying mechanics, as well as educators and anyone interested in the mathematical modeling of motion under resistive forces.

joemama69
Messages
390
Reaction score
0

Homework Statement



an object moves to the right with a constant speed v, the ovbject then enters a region where the resistive force is -bv2, find v(t) & x(t)

Homework Equations





The Attempt at a Solution



Fx = ma = -bv2

v = (ma/-b).5

how do i get t in there
 
Physics news on Phys.org
You are treating "a" and "v" as independent now.
However, the acceleration is related to the velocity as a = dv/dt.
So your equation is actually:
m dv/dt = - b v2

You are going to have to solve a differential equation.
 

Similar threads

  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 25 ·
Replies
25
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 39 ·
2
Replies
39
Views
4K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 13 ·
Replies
13
Views
1K
Replies
6
Views
1K
Replies
16
Views
2K
  • · Replies 6 ·
Replies
6
Views
1K
Replies
12
Views
2K