Free Fall
Free fall motion is...
Object being thrown straight into the air
Object being dropped from some height
An object moving upward in the air is ___________ because gravity is pulling in the opposite direction.
Slowing down!
An object is released from very high up. After 2 seconds how fast is it going?
v = 19.6m/s
A rock is tossed upwards at 40 m/s. How long does it take to reach its highest point?
t = 4.08 s
Ms.Taylor went to ____________high school.
In real life objects, do they use "free fall" motion? Stick to the definition.
No! In real life we always deal with air, which we ignore for free fall motion.
At the very top of upward motion, what does the object do as it changes from moving upward to moving downward?
It stops!
A ball is dropped from a lab table. How far will it travel in 0.3s?
d = 0.441m
A rock is tossed upward with a velocity of 40 m/s. How high does it go?
y = 81.63 m
America's first national park
Yellowstone
What is the acceleration of objects free falling?
-9.8 m/s2
Upward motion is symmetrical. Explain what that means.
It means: distance traveled up = distance traveled down, time to get to the top = time to get back down, speed at a given height going up = speed at same height going down
A physics marble falls a distance of 1.2 meters. How long did it take to hit the ground?
t = 0.35 s
A bow is fired straight into the air with a velocity of 51 m/s. How long does it take to hit the ground?
time up = 5.204s time down = 5.204s because it is SYMMETRICAL total time is 10.408 s
What is a single strand of spaghetti called?
Object A has a mass of 10kg Object B has a mass of 50kg. If we drop both A and B from the same height at the same time, which will hit the ground first?
They will hit the ground at the same time because the acceleration due to gravity (little g) does not change when mass changes.
The first half of upward motion has a positive ___________ and a negative ____________
Initial velocity, acceleration (gravity)
A falling pastry hits the ground with a velocity of 23 m/s. How long was it falling?
t = 2.35s
When a rocket is launched it has an initial velocity of 131 m/s. How fast is it going when it returns to Earth?
131 m/s because upward motion is SYMMETRICAL.
What US State is known for growing coffee beans?
Hawaii
I thrown an object at Kendall, is that free fall? Why or why not?
No, the ball is moving in 2 directions (outward and down). Free fall is only in 1 dimension (just up and down)
Once the object has reached its peak (highest it can travel) we can consider the acceleration to be ____________ until it hits the ground.
negative (still)
A falling chunk of ice smashes into the ground with a velocity of 18 m/s. How high did it fall from?
The height it fell FROM is 16.53 m
A student bouncing on a trampoline is bounced upward at 11.3 m/s. How high does the student go? How long is the student in the air?
y = 6.514m
Time in air = time up + time down = 1.153s + 1.153s = 2.306s
Today is Matthew Lillard's birthday. What famous character is he known for portraying in both live action and animated form?
Shaggy