Aim: How can we define 2D projectile motion?

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Presentation transcript:

Aim: How can we define 2D projectile motion? Do Now: Quiz HW: Problem Set

Projectile Motion Acceleration = -9.8 (m/s)/s Motion is in the X & Y Direction! How is this different form an object moving in only 1-D?

White Board Activity With your group sketch and label all points of interest for a marble rolled horizontally off a desk. Make a kinematics chart.

As the red ball rolls off the edge, a green ball is dropped from rest from the same height at the same time Which one will hit the ground first? They will hit at the SAME TIME!!!

DEMO: Horizontal Ball Drop

Example 1 A ball is rolled off a table with an initial horizontal velocity of 5 m/s from a height of 1m. What is the distance the ball travelled horizontally? What do we know? Y-axis ViY = 0 aY = -9.8 m/s2 dY = 1m t = ? X-axis ViX = 5 m/s aX = 0 dX = ? t = ?

Horizontal Projectile: FACTS All kinematics equations apply, but only in a SPECIFIC direction (x or y) Time horizontally (x) = Time vertically (y) Recognize the velocity VECTOR is tangent the projectiles path and has components. Viy = 0, ay = -9.8 (m/s)/s Make 2 charts… One for each direction!

Example 2 Firing a gun Horizontally I’m skeet shooting on top of a cliff that is 75 meters high and I fire my gun horizontally with an initial velocity of 31.3 m/s. How long was the bullet in the air if I miss and how far away does it land? Bring in an actual nerf gun and figure out in class the initial velocity

Angular projectiles Using the white boards, sketch the path of a kicked soccer ball. Label all points of interest and variables. Sketch a diagram on the board

Projectile Diagram

Describe a step by step procedure for solving a projectile motion problem. It should work for horizontal or angular!

Solid Procedure A) Sketch a picture with labels. B) Draw a small chart separating the vertical and horizontal components. C) Identify the initial horizontal velocity. D) Determine the initial vertical velocity. E) How can we calculate the time it takes the object to land? (hint: think of the demonstration) F) Where does the object land?