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Life Sci 3J03 – Lecture 10 – Projectiles

-Projectile: any object that is given an initial velocity and then allowed to move under the

influence of gravity

- Human body can be considered a projectile whenever it is airborne

- Path followed by the centre of gravity of the object is always parabolic

- Steps in solving projectile problems:

oStep 1: The first step in every projectile problem is to write the equations of

motion

oStep 2: Now substitute the given information

oStep 3: Most difficult step because must look at 6 equations of motion and decide

which ones will be helpful for the answer

- Quadratic equation:

oSolving the equation leaves two possible answers

- If we are ever uncertain about the direction, we can substitute the time into equation [2]

and if velocity is positive, the motion is upward and if velocity is negative, the direction is

downward

- If gravity is the only force acting on the subject, the acceleration in the y direction is

-9.81m/s/s and acceleration in the x direction is 0m/s/s

Example

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