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

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

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?