Using PITCHf/x to Teach Physics Paul Robinson San Mateo High School David Kagan California State University, Chico.

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Presentation transcript:

Using PITCHf/x to Teach Physics Paul Robinson San Mateo High School David Kagan California State University, Chico

Typical Physics Problem A football is kicked with an initial velocity of 25 m/s at an angle of 45-degrees with the horizontal. Determine the time of flight, the horizontal displacement, and the peak height of the football.

Better Physics Problems

Not Just a Slugger… Better Physics Problems

Get the pitch data from mlb Kinematic data Better Physics Problems

Problem 1: (Vector Addition ) Find the initial speed of the ball (at y=50.0ft) in mph. In 3-dimensions the initial speed is the magnitude of the initial velocity vector. Since the components are listed below we take the square root of the sum of their squares, x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 Better Physics Problems

Problem 2: (Projectile Motion) Find the components of the final velocity of the pitch when it reaches the front of home plate (y=1.417ft). Since we know the initial and final y-values we can get the y- component of the velocity using the kinematic equation, x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 v x = ? v y = ft/s v z = ? Better Physics Problems

The time of flight must be found to get the other velocity components. Using another kinematic equation, x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 v x = ? v y = ft/s v z = ? Better Physics Problems Problem 2: (Projectile Motion) Find the components of the final velocity of the pitch when it reaches the front of home plate (y=1.417ft).

Having the time of flight and using kinematic equations for the other two axes, x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 v x = ft/s v y = ft/s v z = ft/s v x = ? v y = ft/s v z = ? Better Physics Problems Problem 2: (Projectile Motion) Find the components of the final velocity of the pitch when it reaches the front of home plate (y=1.417ft). t = s

The final speed is the magnitude of the final velocity vector. Taking the square root of the sum of the squares, x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 v x = ft/s v y = ft/s v z = ft/s t = s Better Physics Problems Problem 2: (Projectile Motion) Find the components of the final velocity of the pitch when it reaches the front of home plate (y=1.417ft).

x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 Problem 3: (2nd Law) Given the weight of a baseball is 0.320lbs, find the x, y, and z components of the force exerted on the ball by the air during its flight. Use Newton ’ s Second Law along each direction. Along x and y the only force is due to the air, F x = ? F y = ? F z = ? F x = 0.132lbs F y = 0.257lbs F z = ? Better Physics Problems

x o = 1.664ft y o = 50.00ft z o = 6.597ft v xo = ft/s v yo = ft/s v zo = ft/s a x = ft/s 2 a y = ft/s 2 a z = ft/s 2 Along z gravity is also in play, F x = 0.132lbs F y = 0.257lbs F z = ? F x = 0.132lbs F y = 0.257lbs F z = 0.146lbs The magnitude of the force caused by the air is, The force exerted by the air is about equal to the weight! Better Physics Problems Problem 3: (2nd Law) Given the weight of a baseball is 0.320lbs, find the x, y, and z components of the force exerted on the ball by the air during its flight.

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