Definitions
Free Fall
Horizontal Projectiles
Projectiles at an angle
Random
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
An object is thrown with a velocity of 15 m/s and an angle of 15.6 degrees. What is the objects vertical and horizontal velocity?
horizontal velocity=14.45 m/s vertical velocity= 4.03 m/s
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
An object shot in the air with a velocity of 20 m/s at an angle of 27 degrees. What is the object's horizontal velocity after 12 seconds.
17.8 m/s
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
An object launched in the air with a velocity of 56 m/s at an angle of 45 degrees. The object is in the air for 3.7 s. What is the object's range?
146.5 m
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

What launch angle will cause a projectile to spend the most time in the air?

90ยบ

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

What is equal and opposite to vyi?

vyf

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.

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