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

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Presentation Transcript
learning goals
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 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
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
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
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
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 distance1
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
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
  • 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 acceleration1
Centripetal Acceleration
  • When an object goes around a curve, the change in direction is toward the center.
centripetal force
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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