Integrating Kinematics for Velocity from Acceleration: A Simplified Approach

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SUMMARY

Integrating acceleration to obtain velocity is essential when acceleration is a function of time, as demonstrated by the equation v = ∫a(t) dt. The discussion highlights that for a constant acceleration, the formula v = at applies, but for variable acceleration, one must integrate the acceleration function. For example, given a(t) = 4 - 0.2t, the velocity can be derived by integrating this function over time, resulting in v(t) = 4t - 0.1t². Understanding this integration process is crucial for accurately calculating velocity from a time-dependent acceleration.

PREREQUISITES
  • Understanding of calculus, specifically integration techniques.
  • Familiarity with kinematic equations and their applications.
  • Knowledge of functions and their behavior over time.
  • Basic concepts of physics related to motion and acceleration.
NEXT STEPS
  • Study the fundamentals of calculus, focusing on integration methods.
  • Explore kinematic equations for variable acceleration scenarios.
  • Learn about the physical interpretation of acceleration functions in motion.
  • Investigate real-world applications of integrating acceleration in physics simulations.
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Students of physics, educators teaching kinematics, and anyone involved in motion analysis or physics simulations will benefit from this discussion.

yup790
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When you want to get velocity from accelleration i have been told you integrate.

Howver v=at and so surley you can just multiply each term in the accelleratin expression by t.

ie:
a=4-0.2t

Surley you can just:
v=(4-0.2t)t
v=4t-0.2t2
 
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The equation v=at is for the situation when the acceleration is a constant. If it is a function of t, you have to integrate. In that case the corresponding equation is dv=a(t)dt, which gives the infinitesimal change in velocity, dv during infinitesimal time interval dt when the acceleration function a(t) is known. When integrating over a finite time interval, you effectively add a large number of small velocity changes dv to get the total change in velocity, Δv.
 
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Thank you. Is there any proof for this. I learn better when I understand the theory behind a topic.
 

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