Free Fall - Gravity
Question:

Introduction

Gravity is a natural phenomenon by which all objects with mass are gravitate toward one another. On Earth, gravity gives weight to physical objects and gravitate them in exact power. 

Free fall in this context, is any motion of a body where gravity is the only force acting upon it  as a result the object will accelerate in an exact amount, independent of its mass. 

On earth the object will accelerate at approximately 9.8 m/s2,

The average velocity of an object is defined as the distance traveled divided by the time elapsed.

The velocity at a certain time for an accelerated object is defined by the formula: 

{displaystyle v(t)=gt+v_{0},}

 

where

v_{0},     is the initial velocity (for free fall its 0 m/s)

v(t), is the vertical velocity with respect to time (m/s).

t,        is time elapsed (s).

g,       is the acceleration due to gravity

Example:

Please watch: http://blossoms.mit.edu/videos/lessons/free_fall

Please watch: https://youtu.be/7_8oPjwv3LY?t=3


Question 1:

An object fall from a building to the ground from a 500 meters height, what is his average velocity and his acceleration according to the graph below?

 

 

 

 

 

 

 

 

 

 

1 People tried to answer this question

His average velocity is 50 m/s, and his acceleration is 5 m/s2.

His average velocity is 250 m/s, and his acceleration is 5 m/s2.

His average velocity is 50 m/s, and his acceleration is 10 m/s2.

His average velocity is 250 m/s, and his acceleration is 10 m/s2.

That's right, from the graph you can see that thw whole displacement is 500 meters, and the whole time is 10 seconds, so deviding the displacement by the time interval you will get the right average velocity that is: 500m/10s = 50 m/s. and the maximum velocity is twice the average velocity by the same perioud of time will give you the acceleration that is 2 * 50m/s/10s = 10 m/s2.

The acceleration is not the division between the average velocity and the passed perioud of time, but the division between the maximum velocity and the passed perioud of time.

The average velocity is the result of deviding the displacement by the time interval.

The acceleration is not the division between the average velocity and the passed perioud of time, but the division between the maximum velocity and the passed perioud of time.

The average velocity is the result of deviding the displacement by the time interval.



Comments:


History of edits
Edited BY: Majdi Hashoul Edit Date: 2017-06-06 04:51:05
Edited BY: Majdi Hashoul Edit Date: 2017-06-06 04:49:14
Edited BY: Majdi Hashoul Edit Date: 2017-06-06 04:45:06
Edited BY: Majdi Hashoul Edit Date: 2017-06-06 02:46:43
Edited BY: Majdi Hashoul Edit Date: 2017-06-06 02:37:47
Edited BY: Majdi Hashoul Edit Date: 2017-06-05 21:53:12