# 2D Motion - Physics 101 / AP Physics 1 Review with Dianna Cowern | Summary and Q&A

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September 16, 2020
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Physics Girl
2D Motion - Physics 101 / AP Physics 1 Review with Dianna Cowern

## TL;DR

Physics explains the possibility of a skateboarder doing tricks on a moving flatbed truck. Motion in two dimensions and projectile motion are explored in this lesson, along with the concept of separating horizontal and vertical motion.

## Key Insights

• 🤩 Physics can explain seemingly dangerous or impossible tricks, such as skateboarding on a moving truck, by separating motion in two dimensions and analyzing projectile motion.
• ❓ Projectile motion is characterized by a parabolic trajectory influenced solely by gravity.

## Transcript

Hey, I'm Dianna Cowern, and welcome to lesson 3 of Dianna's Intro to Physics Class, also known as AP Physics 1 Review, also known as Physics by Dianna. So I this idea of a skateboarder riding on the back of a flatbed truck doing a trick, like a kick flip, while the truck is moving. Sounds dangerous and crazy, I know. But hear me out. Physics explai... Read More

### Q: How does the concept of motion in two dimensions apply to the skateboarder on a moving truck?

Motion in two dimensions allows us to separate the skateboarder's horizontal and vertical motion, explaining how they can perform tricks while the truck is moving. The skateboarder's vertical motion is unaffected by the truck's horizontal motion.

### Q: How is projectile motion different from other types of motion?

Projectile motion refers to the motion of an object influenced only by gravity. Unlike other types of motion, such as linear or circular motion, projectile motion follows a parabolic path.

### Q: What are the key factors to consider in solving a projectile motion problem?

In solving a projectile motion problem, it is important to separate the horizontal and vertical motion and analyze them separately. It is also helpful to calculate the time of flight and break down the initial velocity into horizontal and vertical components.

### Q: How does the Magnus effect explain the curving of a spinning ball, such as in tennis?

The Magnus effect is the phenomenon where a spinning ball experiences a pressure differential in the air, causing it to deviate from a straight path. This effect allows tennis players to create both topspin and slice on the ball, resulting in curving trajectories.

## Summary & Key Takeaways

• This lesson explores the possibility of a skateboarder doing tricks on a moving truck and explains how physics makes it possible.

• Motion in two dimensions is discussed, combining forward/backward and up/down motion.

• Projectile motion, the motion of an object influenced only by gravity, is introduced with examples of throwing eggs and kicking a soccer ball.