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Bell Ringer 1.What does the slope of this graph show? 2.What is the acceleration from 4 seconds to 6 seconds?

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P H Y S I C S Objects in Free Fall and Gravity Objectives: 1)We will understand free fall, and how it is impacted by gravity 2)We will understand what forces act upon an object that is thrown up into the air

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Free Fall Motion of an object when only gravity is acting on it.

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Free-fall acceleration The acceleration of an object due only to the effect of gravity

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Acceleration Due to Gravity g = -9.8 m/s 2 (we’re going to use 10 m/s 2 ) Objects go 10 m/s faster each second Negative Velocity downward movement v = 0 m/s v = -9.8 m/s v = -19.6 m/s v = -29.4 m/s v = -39.2 m/s t = 0 s t = 1 s t = 2 s t = 3 s t = 4 s

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Human Breaks Sound Barrier World Free Fall Record 10/14/2012

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Position and Velocity and Free Fall t = 0 s t = 1 s t = 2 s t = 3 s t = 4 s Position and velocity can be determined as a function of time If you know the time and position, you can determine the velocity.

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Skydivers

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Which drops first?

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Bowling Ball and Tennis Ball

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Demo All objects accelerate at a constant rate of 10 m/s 2 regardless of mass or weight 123 TIMES MORE! Bowling Ball = 7 kg Tennis ball = 0.057 kg

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1 Second Challenge 1 Second in Air “A” for the semester No tardies, cuts or absences 1.225 m in the air to get 1 s.

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Jordan From Free-Throw Line

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Time in Air = 0.98 s

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Objects Thrown Upwards Object thrown upwards experience the same: g = -10 m/s 2 10 m/s slower each second

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Remember… When you are speeding up… You have positive acceleration When you are slowing down… You have negative acceleration Vector A quantity, such as position, that has both magnitude and direction

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Acceleration Due to Gravity v = 0 m/s v = +9.8 m/s v = +19.6 m/s v = +29.4 m/s v = -9.8 m/s v = -19.6 m/s v = -29.4 m/s v = -39.2 m/s Velocity Vector Acceleration “g” Vector

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Velocity Direction Positive (+) value Up Negative (-) value Down

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Peak of the Path Maximum Height Velocity = 0 m/s Returning to Initial Height: Time up = Time down Velocity up = - Velocity down

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Position vs Time Velocity vs Time What is happening at the apex of the position vs time graph? What is happening in the velocity vs. time graph at the x-axis?

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S = ut + 1/2at 2 u and a are positive s t. v = u + at u is positive and a is negative v t.

S = ut + 1/2at 2 u and a are positive s t. v = u + at u is positive and a is negative v t.

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