Free Fall Motion: Definition, Characteristics, Physical Quantities,

Free Fall Motion: Definition, Characteristics, Physical Quantities, Formulas and Examples of Problems – What is meant by free fall motion and how to calculate its physics?, On this occasion Seputartahuan.co.id will discuss it and of course about other things that also surround it. Let's take a look at the discussion in the article below to better understand it

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Free Fall Motion: Definition, Characteristics, Physical Quantities, Formulas and Examples of Problems

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Free Fall Motion (GJB) is one form of straight motion in the Changing Straight Motion group Regular (GLBB) where the movement of objects is only affected by the force of gravity and friction with air. Free fall motion is a movement that occurs without the initial velocity of the object (the initial velocity is zero).

Free fall is a falling motion that is only influenced by the earth's attraction and is free from the obstacles of other forces. Free fall motion including GLBB is accelerated with an initial velocity Vo = zero and an acceleration equal to the acceleration of gravity (g).

During the GJB, the movement of objects will be influenced by two main forces, namely the force of gravity which makes its speed increase and the frictional force with the air that hinders the increase in speed, in this case the gravitational force is always opposite to the frictional force object.

Free fall motion is defined as the motion of an object dropped from a certain height above the ground without initial velocity and in its motion is only affected by the force of gravity.

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Characteristics of Free Fall Motion (GJB)

• Have a vertical straight line cross path
• Has no initial velocity (initial velocity equals zero)
• There is a change in velocity (acceleration or deceleration of an object)
• Movement occurs from a height
• Influenced by the force of gravity and the frictional force of the air resistance.
• The acceleration of the object is equal to the acceleration due to gravity (a = g).

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Free Fall Motion Formula

Free fall motion can be shown that an object falls without an initial velocity from a height h and is affected by the acceleration due to gravity g.

Mathematically, the free fall motion is written:

vt = v0 + a.t

Since v0 = 0 and a = g, the above formula changes to:

vt = g.t

information: vt = velocity (m/s), g = acceleration due to gravity (m/s2), and t = time (s).

The formula for finding an object's height (h) can replace the equation of motion in a straight line changing uniformly, so that the equation for the height of an object for free fall motion is obtained, namely:

h = g.t2

To determine the speed of an object falling freely from a height h, it can be determined using the formula:

Vt = V0 + a x t

Vt = g. t

h = g. t²

Vt² = 2. g. h

Information :

• Vt: Speed ​​at time t seconds (m/s)
• V0: Initial speed (m/s)
• g: Acceleration of gravity (m/s2)
• h: Altitude (m)
• t: Time(s)

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Physical Quantities in Free Fall (GJB)

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  Speed ​​(v)

Speed ​​is one of the quantities in physics that shows how fast an object is moving from one place to another. The international unit used for speed is the meter per second (m/s).

But if in everyday life in Indonesia, we more often use the unit of kilometers per hour (km/hour), while in America it is more often used miles per hour, (miles/hour). Speed ​​can be obtained by multiplying the distance traveled by the time traveled. The symbol for speed is v.

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• Distance(s)

Distance is one of the quantities in physics that shows how far an object changes its position in a certain path.

The international unit for distance is the meter (m), but in everyday life in Indonesia, we often use the kilometer (km) unit.

Whereas in America the units of miles or feet are often used. The result of Distance can be obtained by multiplying the speed with the travel time. The distance in free fall is the height of the object from the surface.

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• Travel Time (t)

Travel time is the time it takes for an object to move from one position to another at a certain speed.

The International Unit of Travel Time is the second (s), the symbol used to represent the travel time is t. Travel time can be obtained by dividing distance by speed.

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• Acceleration (a)

Acceleration is the change in velocity that occurs on an object, occurs due to the influence of the force acting on the object or because of the state of the object.

Because changes that occur in objects in GJB are influenced by the force of gravity, the acceleration is the same as the acceleration of gravity.

The value of the acceleration due to gravity that is used if it is not known in a problem is 9.81m/s² or is added to 10m/s². The symbol used to represent gravity is g.

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Example of Free Fall Motion (GJB)

Problem 1

A coconut falls freely from a tree that is 20 meters high. If the acceleration due to gravity is 10 m/s2, how long will it take for the coconut to reach the ground if air friction is considered non-existent?
Discussion

Is known

g = 10 m/s2

v0 = 0 m/s

h = 20 m

Solution

h = V0 t + g t2

20 = 1/2 10 t2

t2 = 20/5

t = 2 s

So, the time it takes the durian to reach the ground is 2 s.

Problem 2

An object is released from a height of 20 meters above the ground (g = 10 m/s^2). What is the speed of the object after it reaches a height of 15 meters above the ground?
Solution:

Is known:

h1 = 20 m
h2 = 15 m
g = 10 m/s^2

Asked:

vt = ….?

Answer:

h = h1 – h2
h = 20 – 15
h = 5 m
Then we can determine the final velocity:

vt 2 = 2gh
vt 2 = 2.10.5
vt 2 =100
vt = Root 100
vt = 10 m/s
So, the velocity of the object falling is 10 m/s.

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