Chapter 2 Section 3 - Falling Objects

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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


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