An object is in free-fall when there is nothing that inhibits its fall to the earth.
ΣF = -Fg = m(-a) *no air resistance
The acceleration it experiences is due to the force of attraction to the Earth.
In close proximity to earth, the value of this acceleration is 9.8 m/s2.
Since this acceleration is always directed to the center of the earth, we call it a negative acceleration or - 9.8 m/s2.
The symbol for this acceleration is “ag” or sometimes just “g”
Because the acceleration due to gravity is a constant, the 3 equations of motion can be utilized.
vf=vi+at
Δx=vit+1/2at2
vf2=vi2+2aΔx
Round answer to the nearest tenth.
I want to calculate how high I can throw a ball. If I throw it straight up in the air and it leaves my hand at 7 m/s. How would I label 7 m/s?
I want to calculate how high I can throw a ball. If I throw it straight up in the air and it leaves my hand at 7 m/s. Which variable is 0?
I want to calculate how high I can throw a ball. If I throw it straight up in the air and it leaves my hand at 7 m/s. Which variable is 0?
How quickly is the velocity changing as the ball moves upward?
How quickly is the velocity changing as the ball pauses at the top?
How quickly is the velocity changing as the ball falls downward?
A ball is dropped from rest at a height of 3.7 m. How fast will it be going just prior to hitting the ground?
A ball is thrown upward with an initial velocity of 8.52 m/s. How high will it go?
Look back at 7 & 8 and compare the distances and speeds. If you a ball leaves your hand at 5 m/s, it reaches a height of 1.27 m. If you drop a ball from 1.27 m, it will land in your hand at 5 m/s.
Similarly, if you throw a ball upward at 5 m/s, it will take 0.51 seconds to reach the top. If you drop a ball, it will take 0.51 seconds to reach a speed of 5 m/s.
If you throw a ball with 5 m/s and it lands back in your hand, the displacement is 0 and using the second motion equation, you will find the toss took 1.02 seconds.
An egg is dropped from rest. How fast will it be going 0.1 seconds later?
An egg is dropped from rest. How far will it have fallen after 0.1 seconds?
Report answer to thousandth place.
An egg is dropped from rest. How long will it take for the egg to hit the floor 1.2 meters below its release point?
An egg is dropped from rest. How fast will it be going just prior to hitting the floor 1.2 m below its release point?
A ball is thrown upward at an initial velocity of 4.9 m/s. How long it will take the ball to reach its zero velocity point (the peak of its motion)?
A ball is thrown upward at an initial velocity of 4.9 m/s. What is its acceleration at that point?