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

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

  2. Learning Goals • Explain why objects that are thrown will follow a curved path. • Compare circular motion with motion in a straight line.

  3. 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.

  4. 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).

  5. Vertical Motion • After you let go of the ball, gravity pulls it downward. • The ball has constant horizontal velocity but increasing vertical velocity.

  6. 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

  7. 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?

  8. 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.

  9. Mythbusters – Will a fired bullet hit the ground at the same time as a dropped bullet? http://www.youtube.com/watch?v=D9wQVIEdKh8

  10. 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.

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

  12. 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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