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Lecture 10

LIFESCI 3J03 Lecture 10: Projectile Motion
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Department
Life Sciences
Course Code
LIFESCI 3J03
Professor
Dr.Dowling

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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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Description
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: o Step 1: The first step in every projectile problem is to write the equations of motion o Step 2: Now substitute the given information o Step 3: Most difficult step because must look at 6 equations of motion and decide which ones will be helpful for the answer - Quadratic equation: o Solving the equation leaves two possible answers - If we are ever uncertain about the direction, we can substitute the time into equation [2] and
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