Chapter 2 Section 3 - Falling Objects
When an object begins moving down, _______________
it has a negative velocity and a negative acceleration
When an object is at the top of its path, ______________
it has a negative velocity and its acceleration is still -9.81 m/s
When an object is thrown into the air, ______________
it has a positive velocity and a negative acceleration (object is slowing down as it rises)
What does a negative and a negative acceleration mean?
that an object is speeding up (free-fall acceleration)
What happens when objects free fall?
the displacement increases at each time frame, thus, making the velocity higher by each time interval
Freefall
the motion of a body when only the force due to gravity is acting on the body
What changes during an object's free fall, downward acceleration?
the position, the magnitude, and the direction of the velocity
What is acceleration constant during?
the upward and downward motion
Free fall acceleration formula
- g = -9.81 m/s^2
Magnitude of gravity formula (not counting air resistance)
g = 9.81 m/s^2
Imperial formula for magnitude of gravity
g = 32 ft/s^2
What can be learned about two different objects (that have different masses) when dropped from the same height?
both objects traveled the same displacement in the same amount of time
How is free
fall acceleration demonstrated? - by greater displacements between the image frames and time intervals
What does knowing the free
fall acceleration help with? - it makes it easy to calculate the velocity, time, and displacement of many different motions using the equations for constantly accelerated motion