Horizontal Launch
A ball is lauinched horizontally from a cliff. What is its initial vertical velocity?
0 m/s
What is the horizontal acceleration of a projectile when air resistance is ignored?
0 m/s2
What two components must the initial velocity of an angled projectile be separated into?
Horizontal and vertical velocity components
What is the vertical velocity and acceleration of a projectile at the highest point of its trajectory?
0 m/s, -9.81 m/s2
What two velocity components must be combined to determine the magnitude of a projectile's final velocity?
v0x and vy
A ball is launched horizontally at 15 m/s. Ignoring air resistance, what is its horizontal velocity 2.0 seconds later?
15 m/s
What is the vertical acceleration of a projectile near Earth's surface if upward is positive?
-9.81 m/s2
What equation is used to calculate the initial horizontal velocity component?
v_(0x)=v_0costheta
A projectile is launched and lands at the same elevation. How does its final angle compare with its initial angle?
They are the same
What equation is used to find the magnitude of the resultant final velocity?
v=sqrt(v_x^2+v_y^2)
A ball is launched horizontally from a 20.0 m-high cliff. How long does it take to reach the ground?
2.02 s
What variable connects the horizontal and vertical components of projectile motion?
What equation is used to calculate the initial vertical velocity component?
v_(0y)=v_0sintheta
A projectile lands below its launch point. If upward is positive, is its vertical displacement positive or negative?
Negative
A projectile has a horizontal velocity of 12 m/s and a final vertical velocity of -5.0 m/s. Calculate the magnitude of its final velocity.
13 m/s
A ball is launched horizontally at 12.0 m/s from a 20.0 m-high cliff. How far horizontally does it travel before hitting the ground?
24.2 m
A ball is dropped from a cliff at the exact same time that another ball is launched horizontally from the same height. Which ball hits the ground first?
They hit at the same time
A ball is launched at 20.0 m/s at 30 degrees above the horizontal. Calculate its initial vertical velocity.
10.0 m/s
Why can't you simply double the time required to reach maximum height when a projectile lands at a different elevation?
The upward and downward portions are not symmetrical because the projectile does not return to its original elevation.
A projectile has vx = 15 m/s and vy = -20 m/s immediately before impact. Find the magnitude and direction of its final velocity.
25 m/s at 53 degrees below the horizontal
A ball is launched horizontally at 16.0 m/s from a 30.0 m-high cliff. Calculate the magnitude of its final velocity immediately before impact.
28.8 m/s
A projectile is moving upward and to the right. Describe the signs of its vx, vy, ax, and ay.
vx: positive
vy: negative
ax: 0
ay: negative
A projectile is launched at 24.0 m/s at 40 degrees above horizontal. Calculate both initial velocity components.
v_(0y) = 15.4 m/s
v_(0x) = 18.4 m/s
Which vertical-motion equation can be used to determine the time when a projectile lands at a different elevation?
Deltay = v_(0y)t+1/2g*t^2
A ball is launched horizontally at 10.0 m/s from a 20.0 m-high cliff. Determine the magnitude and direction of its final velocity immediately before hitting the ground.
22.2 m/s at 63.0 degree below the horizontal