Falling Objects and Projectile Motion Physics 1010 13 June 2012.

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Presentation transcript:

Falling Objects and Projectile Motion Physics June 2012

Acceleration Due to Gravity Falling objects accelerate to the earth due to gravitational attraction. The Relationship is the same as for any acceleration. The acceleration of gravity is a vector pointing downward. The sign depends on reference: up or down.

Measuring Gravitational Acceleration Galileo’s method: Use your pulse as a timer and an inclined plane to slow the acceleration in proportion to the angle of slope. Stroboscopic light: The action in the photo stops at predetermined intervals (Δt = 0.05 sec in book illustration). Measure distances from the photo and scale to actual distances. Timer and track: Use a timer instead of pulse on specific distances down the track. Our lab did this.

Aristotle and Galileo How were their results different? Why?

Dropping a Ball Using the equations: We can solve all problems with a falling object.

Tossing a ball upward Using the equations: We can do any problem with a ball tossed upward. We just need to watch the directions.

Projectile Motion Using these equations for the up (y) direction: Using these equations for the horizontal (x) direction We have it all!

Max Distance Finding initial components of velocity: Θ