Chapter-3 Falling Objects and Projectile Motion

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Presentation transcript:

Chapter-3 Falling Objects and Projectile Motion Overview: Explore how objects move under the influence of gravity close to the surface of the earth. Outline: Acceleration due to gravity Falling object Projectile motion

Falling Objects Why objects fall to the ground when released? When you drop objects of different sizes and weights, do they reach the ground at the same time? (Click the link below) http://www.teachersdomain.org/resource/phy03.sci.phys.mfw.galmoon/ Measuring the acceleration due to gravity for Earth: 9.8 m/s2

Falling Object: Velocity and Distance

Spread Sheet (Excel) Calculations v=v0 + at d=v0t+1/2 at2 Reaction Time Experiment

Throwing up a ball: Velocity and Distance Q: A ball is thrown straight upward and then returns to the Earth. Does the acceleration change during this motion?

Throwing up a ball: Velocity VS. Time graph

Projectile Motion: A Cartoon Coyote Falling off a Cliff We need to consider the horizontal and vertical motions separately in projectile motions. Time is the same for both motions.

Horizontal and Vertical motions Q: What determines the time of flight? A: Vertical motion Practice Sample Exercise in example box 3.4

Angle for maximum Range http://phet.colorado.edu/simulations/sims.php?sim=Projectile_Motion Go to the above website and determine the angle for maximum range by firing at different angles. ______________

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