# 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.

### 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