Section 3 2 part 2 projectile motion and centripetal force
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Section 3.2 (Part 2) - Projectile Motion and Centripetal Force PowerPoint PPT Presentation


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Section 3.2 (Part 2) - Projectile Motion and Centripetal Force. Learning Goals. Explain why objects that are thrown will follow a curved path. Compare circular motion with motion in a straight line. Projectile Motion. Projectile – anything that is thrown or shot through the air

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Section 3.2 (Part 2) - Projectile Motion and Centripetal Force

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Section 3.2 (Part 2) - Projectile Motion and Centripetal Force


Learning Goals

  • Explain why objects that are thrown will follow a curved path.

  • Compare circular motion with motion in a straight line.


Projectile Motion

  • Projectile – anything that is thrown or shot through the air

  • Thrown objects don’t always travel in straight lines – they curve downward.

    • This is because the Earth’s gravity causes projectiles to follow a curved path.


Horizontal Motion

  • When you throw a ball, the force exerted by your hand pushes the ball forward.

  • After you let go of the ball, no force is accelerating it forward.

    • The horizontal velocity is constant (ignoring air resistance).


Vertical Motion

  • After you let go of the ball, gravity pulls it downward.

  • The ball has constant horizontal velocity but increasing vertical velocity.


Horizontal and Vertical Motion

  • Gravity exerts an unbalanced force on the ball, changing its direction from only forward to forward and downward.

    • Results in the curved path

      • Horizontal and vertical motions are independent of one another


Horizontal and Vertical Distance

  • If you throw a ball as hard as you can from shoulder height in a perfectly horizontal direction, would it take longer to reach the ground than if you dropped a ball from the same height?


Horizontal and Vertical Distance

  • A thrown ball and dropped ball will hit the ground at the same time.

  • Both balls travel the same vertical distance in the same amount of time.

  • The thrown ball travels a greater horizontal distance.


Mythbusters – Will a fired bullet hit the ground at the same time as a dropped bullet?

http://www.youtube.com/watch?v=D9wQVIEdKh8


Centripetal Acceleration

  • Centripetal acceleration – acceleration towards the center of a curved or circular path.

  • In a curve, an object is accelerating because its direction is constantly changing.


Centripetal Acceleration

  • When an object goes around a curve, the change in direction is toward the center.


Centripetal Force

  • Centripetal force – net force exerted toward the center of a curved path

http://www.youtube.com/watch?v=yyDRI6iQ9Fw


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