Chapter-3 Kinematics in Two Dimensions

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Motion in Two Dimensions

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Presentation transcript:

Chapter-3 Kinematics in Two Dimensions Projectile Motion

Kinematics Equations in 2 dimensions 1. 2. 3. 4. 5.

3.4 Projectile Motion Assumptions: 1. Air resistance is neglected 2. Gravity is constant, 9.8 m/s2, down. What is the launch angle for maximum range? http://phet.colorado.edu/simulations/sims.php?sim=Projectile_Motion

Velocity of a projectile and the shape of its trajectory Trajectory is an inverted parabola.

Problem 26 A ball is kicked with an initial velocity of 16 m/s in the horizontal direction and 12 m/s in the vertical direction. (a) At what speed does the ball hit the ground? (b) For how long does the ball remain in the air? (c)What maximum height is attained by the ball?

Football Kickoff A place-kicker kicks a football at an angle of 400 above the horizon with a speed of 22 m/s. Find the hang time, range R, and maximum height H.

A Falling Care Package An airplane moving horizontally with a constant velocity of +115 m/s at an altitude of 1050 m. The plane releases a “care package” that falls to the ground along a curved trajectory to reach some stranded hikers. How far horizontally ahead the package should be released?

Demonstration http://www.youtube.com/watch?v=cxvsHNRXLjw

Conceptual Example Suppose you are driving in a convertible with the top down. The car is moving to the right at a constant velocity. As Figure 3.11 illustrates, you point a rifle straight upward and fire it. In the absence of air resistance, where would the bullet land—behind you, ahead of you, or in the barrel of the rifle?

Playing Shortstop A player picks up a ground ball and throws it horizontally with a speed of 24 m/s. It is caught after 0.42 s later at point B. a. How far apart are the two players? b. What is the distance of vertical drop, AB?

Example 3.4 A Fireworks Projectile Explodes High and Away. During a fireworks display, a shell is shot into the air with an initial speed of 70.0 m/s at an angle of 75.0º above the horizontal, as illustrated in Figure 3.39. The fuse is timed to ignite the shell just as it reaches its highest point above the ground. (a) Calculate the height at which the shell explodes. (b) How much time passed between the launch of the shell and the explosion? (c) What is the horizontal displacement of the shell when it explodes?

Projectile to Satellite https://www.youtube.com/watch?v=IC1JQu9xGHQ