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Gravity & Free Fall
Elephant vs. Feather If both are dropped from the same height at the same time, which will hit the ground first? On Earth? On the moon?
Freefall Movement of an object towards earth solely because of gravityGravity acts downwards towards center of earth Acceleration due to gravity for any falling object = g g= 9.8 m/s2
What “g” means Any object in free fall will increase its speed/velocity by 9.8 m/s each second. g (9.8 m/s2) stays constant for the duration of free fall
Ball in free fall Time = 0 s v = 0 Time = 1 s v = 9.8 m/sThe change in ball’s speed is always 9.8 m/s2 Time = 2 s v = 19.6 m/s ball is covering more distance the longer it falls Time = 3 s v= 29.4 m/s
Viewing Free Fall Free Fall applet
Air Resistance Present on earth acts in opposite direction of gravity(reduces acceleration) Falling Ball Gravity g=9.8m/s2 Air resistance
Air Resistance If objects fall for long period of time:Force of Air resistance = force of gravity Forces balanced Object falls at constant speed called terminal velocity
Terminal Velocity Air resistance increases with: 1. Increasing Speed2. Increasing surface area Parachutes slow downward acceleration
Viewing Terminal Velocity
Elephant vs. Feather Without air resistance (outer space)Free falling objects Both hit at same time
Elephant vs. Feather With air resistance (earth) With air resistanceElephant hits first
8th Grade Investigation 7 Force and Motion
Gravity and Free Fall.
Newton’s 2nd Law of Motion F=ma. units Multiple forces can be exerted on an object at the same time.
Free FallChapter 4 Tiffany Rhodes. We all know the effects of gravity? Right???
ACCELERATION AND GRAVITY Unit 2; Chapter 2. WHAT IS GRAVITY? Definition: A force of attraction between things that have mass Anything that has mass, no.
Free Fall What did the video show?
Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Law of Universal Gravitation Sir Isaac Newton (1642–1727) gave us.
Free Fall & Air Resistance The Earth’s ________ pulls objects towards its center When the only force acting on a falling object is gravity, the object.
< BackNext >PreviewMain Section 2 Gravity and Motion Chapter 13 What You Will Learn The acceleration due to gravity is the same for all objects near Earth’s.
Friction and Gravity.
Gravity, Air Resistance, Terminal Velocity, and Projectile Motion
SPS8.c Relate falling objects to gravitational force.
Gravity. Law of Universal Gravitation The force of gravity applies to everything in the universe The force of gravity applies to everything in the universe.
The Force of Gravity. Gravity Gravity- the force that pulls objects towards the Earth Free fall- when the only force acting on an object is gravity –
Free Fall The acceleration of gravity (g) for objects in free fall at the earth's surface is 9.8 m/s2. Galileo found that all things fall at the same rate.
Free Fall & Projectiles Chapter 3, sections 7-9 & Chapter 8, sections 1-4.
Chapter 6 Forces In Motion
Newton’s Second Law of Motion You will be learning: 1.Newton’s Second Law of Motion. 2.Three types of friction. 3. The effects of air resistance on falling.
Galileo discovered that mass does not affect the time it takes for an object to fall to the ground. Objects fall at the same rate (on earth it is.
What would happen if you jumped into a well that went all the way through Earth? See answer in video.
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