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- Students:Good morning, ma’am!
- Today, we will introduce projectile motion and its components. I hope that you read the modules I have sent two days ago.
- Goodmorning class!
- Ma’am, Projectile motion it is a type of motion wherein an object is thrown in the air and moves a curved path under gravity alone.
- The object is called a projectile, and its path is called its trajectory. As an object travels through the air, it encounters a frictional force that slows its motion called air resistance.
- That’s correct. Projectile motion is the motion of an object thrown (projected) into the air. After the initial force that launches the object, it only experiences the force of gravity.
- First, does anyone can define what is projectile motion? Yes,Rachel.
- The two components of projectile motion are horizontal motion and vertical motion.
- Lia, what is the two components of projectile motion?
- Very good, Lia.
- Franz, can you define what is horizontal motion?Also, give one example.
- Horizontal motion is when the object moves horizontally. One example is a ball rolling on a horizontal plane would neither speed up nor slow down.
- The force of gravity controls the vertical motion of a projectile. This indicates that the ball is being acted upon by an imbalanced force, causing it to accelerate downward. One example is A ball is thrown upwards from a balcony with a speed of 3 m/s, 8 m above the ground.
- Paul, can you define what is vertical motion and its example?
- None, ma’am.
- Well done class. But you must know that these components don’t influence one another. For example, look at this figure, it compares a cannonball in free fall (in blue)to a cannonball launched horizontally in projectile motion (in red). You can see that the cannonball in free fall falls at the same rate as the cannonball in projectile motion. Keep in mind that if the cannon launched the ball with any vertical component to the velocity, the vertical displacements would not lineup perfectly.
- Students:Yes, ma’am.
- Alright, if there is no questions, class dismiss. Thank you for listening.
- Okay, is there any questions?
- Do you all understand?
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