Free fall
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Free Fall. Motion Notes Day 4. Galileo Galilei. 1564 - 1642 Galileo formulated the laws that govern the motion of objects in free fall. Free Fall. All objects moving under the influence of gravity only are said to be in free fall Free fall does not depend on the object’s original motion

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Free Fall

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Free fall

Free Fall

Motion Notes Day 4


Galileo galilei

Galileo Galilei

1564 - 1642

Galileo formulated the laws that govern the motion of objects in free fall


Free fall1

Free Fall

All objects moving under the influence of gravity only are said to be in free fall

Free fall does not depend on the object’s original motion

All objects falling near the earth’s surface fall with a constant acceleration

The acceleration is called the acceleration due to gravity, and indicated by g


Acceleration due to gravity

Acceleration due to Gravity

Symbolized by g

g = -9.8 m/s2

g is always directed downward

toward the center of the earth

Ignoring air resistance and assuming g doesn’t vary with altitude over short vertical distances, free fall is constantly accelerated motion


Free fall an object dropped

Free Fall – an object dropped

Initial velocity is zero

Let up be positive

Use the kinematic equations

Acceleration is g = -9.8 m/s2

vi= 0

a = g


Free fall an object thrown downward

Free Fall – an object thrown downward

a = g = -9.8 m/s2

Initial velocity ≠ 0

With upward being positive, initial velocity will be negative

Vi= (-)

a = g


Free fall an object thrown upward

Free Fall – an object thrown upward

a = g = -9.8 m/s2

Initial velocity ≠ 0

With upward being positive, initial velocity will be positive

final velocity = 0

Vi= (+)

a = g


Free fall example

Free Fall - Example

If a rock is dropped from a building, and it takes 18 seconds to reach the ground, how tall is the building?


Practice

Practice

A baseball is thrown up vertically with a velocity of 12 m/s.

a. What is the maximum height the baseball reaches?

b. How long does it take to reach max height?

c. What is the velocity when it hits the ground?


Practice1

Practice

A baseball is thrown up vertically with a velocity of 12 m/s.

a. What is the maximum height the baseball reaches?


Practice2

Practice

A baseball is thrown up vertically with a velocity of 12 m/s.

a. d= 7.3 m (We can use this now!!)

b. How long does it take to reach max height?


Practice3

Practice

A baseball is thrown up vertically with a velocity of 12 m/s.

a. d= -7.3 m (negative because falling!!)

b. t= 1.22s (We can use this now!!)

c. What is the velocity when it hits the ground? (Now we assume falling with Vi = 0)


Homework

Homework

  • Complete 1-16 on 1D Kinematics Worksheet

  • Answers will be posted on Website!!!

  • Tomorrow and Friday we will review graphing

  • Quiz Friday

  • Motion Test Thursday, Sept 12!!!


Free fall

Position-time graphs show how the position of an object changes over time.

So, the slope of a d/t graph tells us the VELOCITY of the object.


Free fall

Velocity-time graphs show how the velocity of an object changes over time.

So, the slope of a d/t graph tells us the ACCELERATION of the object.


Free fall

The slope is constantly changing, so that means the velocity is changing. Changing velocity is called ACCELERRATION.


Free fall

The area under the graph represents displacement (Δd).


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