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Section 3.2 (Part 2) - Projectile Motion and Centripetal ForcePowerPoint Presentation

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

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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

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

- Explain why objects that are thrown will follow a curved path.
- Compare circular motion with motion in a straight line.

- 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.

- 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).

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

- 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

- Results in the curved path

- 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?

- 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.

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

- 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.

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

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

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