You will need a group whiteboard for today FreeFall The act of falling towards the ground solely under the influence of the gravitational pull of the planet ie Earth Dependent on the mass and size of the planet ID: 539964
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Slide1
Falling Bodies
Pages 39-41
A.S. = 2.1.6Slide2
Some history of falling bodies assumptions
Aristotle
Speed of fall proportional to object’s weight
Speed of fall inversely proportional to density of medium
Slight acceleration close to Earth…but vague mention
Galileo
Things accelerate when falling towards Earth
Mass doesn’t matterSlide3
Free-Fall
The act of falling towards the ground solely under the influence of the gravitational pull of the planet (i.e. Earth)
Dependent on the mass and size of the planet
Varies across the planet
World-wide average for the acceleration due to gravity at/near the surface of Earth:
=magnitude of acceleration
Slide4
Practice Problem #1
A sandbag is hanging from the rafters of a theater 21.5 m above the stage floor. If the ropes break and it drops,
How fast will it be moving the instant it hits the floor?
How much time will it take to reach the ground?Slide5
Practice Problem #2
A baseball player tossed a ball straight up into the air with an initial velocity of 9.35 m·s
-1
.
What was the maximum height that it reached?
How much time was it in the air, assuming it was caught at the same height as it had been released?