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Free Fall
Horizontal Projectiles
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100

What is another word for vertical displacement?

height

100
At the same time, Dave drops a rock straight down, but Tonia throws a rock with a horizontal velocity. Whose rock hits the ground first?
They hit the ground at the same time.
100
What is the initial vertical velocity of a horizontal projectile?
0
100

The resultant of the horizontal and vertical components of an object in motion

Projectile Motion

100
A projectile is thrown up from 0 height, and falls back to 0 height. If you know the time it spent falling down, how do you calculate total time?
Multiply by 2.
200

What is another word for horizontal displacement?

range

200
What is the value of the vertical velocity of an object at it's maximum height?
0
200
What is the acceleration of projectiles?

-9.8 m/s2 vertically on/near earth's surface

200

The vertical change in velocity is constant in the downward direction

acceleration due to gravity

200
Vertical velocity is determined from what equation?

vf = vi + at, and a = -g = -9.8 m/s2.

300
What is the name for the projectile's path?
Trajectory
300
What varies the acceleration of objects falling on the moon?
Nothing; everything falls with the same acceleration.
300
How does the initial horizontal speed of an object affect the time it spends in the air and how far it moves?
It does not affect time, but the faster the horizontal speed, the farther the object moves.
300

Air resistance prevents further acceleration of a falling object

terminal velocity

300
How much will the horizontal velocity change 19.6 s into a projectile's long flight?
It won't.
400
What is the shape of a projectiles path?
Parabola
400
A penny is dropped, from rest out a window from a height of 12 m. How long will it take the velocity of the penny to reach 5.6 m/s?
.6 s
400
A physics student who is curious about the trajectory of a paint ball stands with his gun horizontal and fires it off. The paint ball leaves the gun from a height of 3.5 m and lands on the ground 36.0 m away. How long was the ball in the air?
0.85 s
400

Point at which the vertical velocity of an object in motion equals zero

maximum height

400
In what direction is all of the velocity at the top of a projectile's peak?
The initial horizontal direction.
500
What do we call an object moving in a parabolic arc under the influence of only gravity?
a projectile
500
A tennis ball is thrown from a window straight down to the ground below. If the ball is thrown down with an initial velocity of 2.6 m/s and falls a distance of 8 m, what is its final velocity just before it hits the ground?
-12.8 m/s
500
A physics student who is curious about the trajectory of a paint ball stands with his gun horizontally and fires it off. The paint ball leaves the gun from a height of .75 m and lands on the ground 3.0 m away. What was the horizontal velocity?
7.7 m/s
500

Motion in which gravity is the only acceleration acting on the object in any direction

free fall

500

Draw a projectile's vertical velocity vs time graph. Label where the object is at it's highest point

\. Slope is -9.8 m/s2.  Peak height where vy = 0.