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Kinematics in Two Dimensions Chapter 3

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3.2 Equations of Kinematics in Two Dimensions Equations of Kinematics

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3.2 Equations of Kinematics in Two Dimensions

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The x part of the motion occurs exactly as it would if the y part did not occur at all, and vice versa.

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3.2 Equations of Kinematics in Two Dimensions Example 1 A Moving Spacecraft In the x direction, the spacecraft has an initial velocity component of +22 m/s and an acceleration of +24 m/s 2. In the y direction, the analogous quantities are +14 m/s and an acceleration of +12 m/s 2. Find (a) x and v x, (b) y and v y, and (c) the final velocity of the spacecraft at time 7.0 s.

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3.2 Equations of Kinematics in Two Dimensions Example 1 A Moving Spacecraft In the x direction, the spacecraft has an initial velocity component of +22 m/s and an acceleration of +24 m/s 2. In the y direction, the analogous quantities are +14 m/s and an acceleration of +12 m/s 2. Find (a) x and v x, (b) y and v y, and (c) the final velocity of the spacecraft at time 7.0 s. xaxax vxvx v ox t ?+24.0 m/s 2 ?+22 m/s7.0 s yayay vyvy v oy t ?+12.0 m/s 2 ?+14 m/s7.0 s

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3.2 Equations of Kinematics in Two Dimensions xaxax vxvx v ox t ?+24.0 m/s 2 ?+22 m/s7.0 s

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3.2 Equations of Kinematics in Two Dimensions yayay vyvy v oy t ?+12.0 m/s 2 ?+14 m/s7.0 s

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3.2 Equations of Kinematics in Two Dimensions

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3.3 Projectile Motion Conceptual Example 5 I Shot a Bullet into the Air... Suppose you are driving a convertible with the top down. The car is moving to the right at constant velocity. You point a rifle straight up into the air 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?

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Projectile Motion Objects that are thrown or launched into the air and are subject to gravity are called projectiles. Projectile motion is the curved path that an object follows when thrown or launched near the surface of Earth. If air resistance is disregarded, projectiles follow a parabolic shape. Section 3.3 Projectile Motion

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Projectile motion is free fall with an initial horizontal velocity. Demo

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X-motion is ALWAYS independent of Y-motion If you dont know time (t), solve for it FIRST –Why? Time is the same for both directions A y = -9.81 m/s 2 A x = 0 m/s 2 (Velocity is constant in the x-direction). Write down given information (and in what direction Tips for solving projectile motion problems

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3.3 Projectile Motion Example 3 A Falling Care Package The airplane is moving horizontally with a constant velocity of +115 m/s at an altitude of 1050m. Determine the time required for the care package to hit the ground.

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3.3 Projectile Motion yayay vyvy v oy t -1050 m-9.80 m/s 2 0 m/s?

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3.3 Projectile Motion yayay vyvy v oy t -1050 m-9.80 m/s 2 0 m/s?

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3.3 Projectile Motion Example 4 The Velocity of the Care Package What are the magnitude and direction of the final velocity of the care package?

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3.3 Projectile Motion yayay vyvy v oy t -1050 m-9.80 m/s 2 ?0 m/s14.6 s

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3.3 Projectile Motion yayay vyvy v oy t -1050 m-9.80 m/s 2 ?0 m/s14.6 s

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3.3 Projectile Motion Example 6 The Height of a Kickoff A placekicker kicks a football at an angle of 40.0 degrees and the initial speed of the ball is 22 m/s. Ignoring air resistance, determine the maximum height that the ball attains.

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3.3 Projectile Motion

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yayay vyvy v oy t ?-9.80 m/s 2 014 m/s

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3.3 Projectile Motion yayay vyvy v oy t ?-9.80 m/s 2 014 m/s

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3.3 Projectile Motion Example 7 The Time of Flight of a Kickoff What is the time of flight between kickoff and landing?

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3.3 Projectile Motion yayay vyvy v oy t 0-9.80 m/s 2 14 m/s?

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3.3 Projectile Motion yayay vyvy v oy t 0-9.80 m/s 2 14 m/s?

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3.3 Projectile Motion Example 8 The Range of a Kickoff Calculate the range R of the projectile.

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3.3 Projectile Motion Conceptual Example 10 Two Ways to Throw a Stone From the top of a cliff, a person throws two stones. The stones have identical initial speeds, but stone 1 is thrown downward at some angle above the horizontal and stone 2 is thrown at the same angle below the horizontal. Neglecting air resistance, which stone, if either, strikes the water with greater velocity?

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