Mechanics 2 - Projectiles

Key points for Projectile Kinematics in M2.

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  • Created by: Flame10A
  • Created on: 17-04-13 12:56

Introduction to Projectiles

Projectiles have both Horizontal and Vertical motion;

Vertical Motion

  • Vertical motion has Constant Acceleration of g=9.8ms⁻⁻²

Horizontal Motion

  • The Speed of horizontal motion of projectiles is Constant
  • The main formula for this type of motion is:

Distance = Speed * Time

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Differentiation and Integration of Values

  • It is possible to find Velocity by differentiating Displacement with respect to Time:

v = dx / dt

  • Acceleration can be found by differentiating Velocity with respect to Time:

a = dv / dt

   = d²x / dt²

  • From this, Velocity can be found by integrating Acceleration with respect to Time:

v = ∫a dt

  • And Displecement by integrating Velocity with respect to Time:

x = ∫v dt

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Differentiation & Integration Diagram

This is another way to view the differentiations and integrations:

┏━━
Displacement
┗━

 Differentiate ↓          ↑Integrate       

┏━━
┃    Velocity    ┃
┗━

 Differentiate ↓          ↑Integrate       

┏━━
 Acceleration
┗━

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Vectors and the Dot Notation

In some cases, dots are used to show single or double differentiations (with respect to time);

If r = xi + yj then v = dr / dt = = ẋi + ẏj
       ‥    ‥    ‥
   
and a = dv / dt = d²r / dt² = r = xi + yj

When integrating vectors with respect to time, the constant of integration is a vector:

v = ∫a dt

r = ∫v dt

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