Chapter 2 Section 3 falling Objects. Objectives  Relate the motion of a freely falling body to motion with constant acceleration.  Calculate displacement,

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Presentation transcript:

Chapter 2 Section 3 falling Objects

Objectives  Relate the motion of a freely falling body to motion with constant acceleration.  Calculate displacement, velocity, and time at various points in the motion of a freely falling object.  Compare the motions of different objects in free fall.

What is free falling  Free fall is the motion of a body when only the force due to gravity is acting on the body.  The acceleration on an object in free fall is called the acceleration due to gravity, or free-fall acceleration.

What is gravity ?  Gravity is the force that acts on our bodies and keep us bond to earth.  The acceleration on an object in free fall is called the acceleration due to gravity, or free-fall acceleration.  Free-fall acceleration is denoted with the symbols a g (generally) or g (on Earth’s surface).  the magnitude of free fall acceleration or gravity is g = 9.81 m/s 2.

Free fall acceleration  Free-fall acceleration on Earth’s surface is –9.81 m/s 2 at all points in the object’s motion.  Consider a ball thrown up into the air.  Moving upward: velocity is decreasing, acceleration is – 9.81 m/s 2  Top of path: velocity is zero, acceleration is –9.81 m/s 2  Moving downward: velocity is increasing, acceleration is – 9.81 m/s 2

Falling objects Jason hits a volleyball so that it moves with an initial velocity of 6.0 m/s straight upward. If the volleyball starts from 2.0 m above the floor, how long will it be in the air before it strikes the floor?

Worksheet  Free fall acceleration worksheet

Homework  Lets do page 60 practice problems 1-4

Closure  Today we learn about free falling and gravity  Next class we are going to continue with a lab

Have a great day!!!!