Vocab and Stuff
This velocity is constant during projectile motion
What is Vx or Horizontal Velocity
When projected horizontally, this is always zero.
What is Vyi? or ax works too
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal.
How long does it take to get to the peak?
ttop = .84 seconds.
A marble is launched at a ten degree angle and an initial velocity of 20 m/s. What is Vx
19.7 m/s
What is Range (or x)?
A plane drops a package, and (ignoring air friction) it lands directly under the plane (as oppposed to infront or behind it).
Why is that?
They both have the same horizontal velocity when launched, and there is no acceleration to change them.
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal.
a) What is the maximum height reached by the object?
3.6 m above the launch point
Vx = 30.3
Vy = 17.5
This is zero at a projectile's peak.
What is Vy?
A ball rolls off the edge of a 1.5 m tall counter at a speed of 4 m/s. What is its horizontal range? Round to two decimal places.
2.2 meters
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal.
What is its horizontal range?
30 m
Matt walks 2 m in a straight line to the North and then another 8 m in a straight line to the East. His displacement is...
8.2 m
There is a constant acceleration acting on this velocity during projectile motion
What is Vy or Vertical Velocity?
A ball is thrown perfectly horizontally from 2 m above the ground, and lands 55 m away. What was the ball's initial speed?
87 m/s
Jordan kicks a soccer ball at an angle of 24° with an initial speed of 15 m/s. If the field he is on is level, how far does it go horizontally before landing?
17 meters
An object moves 20 m towards east and then 10 m towards west in 5 seconds. What is its average velocity and average speed?
6 m/s
When solving projectile motion problems, it is necessary to break the total velocity into these.
What are components?
What is the horizontal force experienced by a projectile after the initial force that launched it into the air in the absence of air resistance?
None.
A ball is kicked upwards at an angle of 45° with an initial speed of 41.58 m/s. Draw a diagram that shows the X and Y velocity vectors (the arrows) for the ball's motion.
Vy should be decreasing, zeroed and increasing.
Vx should be constant the whole time
You walk 90 m south and then 78 m east over the course of 2 minutes. Your friend walks along the path of your displacement. How much of a head start can you have and him still beat you if he walks the same speed.
About 35 seconds.