Critical Question: What causes the path of a projectile to be curved? Projectile Motion Critical Question: What causes the path of a projectile to be curved? A projectile is any object thrown in the air (on earth)

Projectile Motion Critical Question: GRAVITY!!!! A projectile is any object thrown in the air (on earth)

Projectile Motion Gravity – two masses that apply an attractive force towards each other. The amount of gravitational pull DEPENDS on an objects mass and distance of the objects.

The greater an objects mass, the stronger the gravitational force. Question: The bigger you are (more mass) the more or less your weight??

Projectile motion refers to the motion of an object that is thrown, or projected into the air at an angle. The motion of a projectile is determined only by the object’s initial velocity and gravity.

Projectile motion applies to sports.

Projectile motion applies to destructive projectiles.

Projectile motion is a combination of horizontal motion and vertical motion.   The horizontal motion of a projectile is constant because no gravitational force acts horizontally

A projectile moves horizontally with constant velocity, while being accelerated vertically (gravity). The result is a motion in a curved path.

An object projected horizontally will reach the ground in the same time as an object dropped vertically. No matter how large the horizontal velocity is, the downward pull of gravity is always the same.

Horizontally launched projectile Horizontal velocity is constant. Vertical velocity is changing due to gravitational acceleration..

Vertically launched projectile The horizontal velocity component remains the same size throughout the entire motion of the cannonball.

Projectiles launched at different angles.

Sports Trivia Maximum range is achieved if the projectile is fired at an angle of 45 degrees with respect to the horizontal.

Test your knowledge Suppose an airplane drops a flare while it is moving at constant horizontal speed at an elevated height. Assuming that air resistance is negligible, where will the flare land relative to the plane? A. Directly below the plane. B. Below the plane and ahead of it. C. Below plane and behind it.

Test your knowledge Suppose an airplane drops a flare while it is moving at constant horizontal speed at an elevated height. Assuming that air resistance is negligible, where will the flare land relative to the plane? A. Directly below the plane. B. Below the plane and ahead of it. C. Below plane and behind it.

Why does the horizontal component of a projectile’s motion remain constant? Because no force acts on it horizontally.

Why does the vertical component of a projectile’s motion undergo change? Because gravity is pulling it downward.

Momentum – the force gained by a moving object Measured by the product of mass times velocity p=mv (p=momentum)

What are the units of Momentum? (the force gained by a moving object) p=mv (p=momentum) kg m s Hmmm this looks familiar!!

Test your knowledge Which is more difficult to stop? A truck that weighs 2948.35 kg, traveling down the highway at 35m/s or a sports car that weights 1,418 kg traveling the same speed. A. The Truck. B. The sports car. C. Both with be equally difficult to stop

Which is more difficult to stop. A truck that weighs 2948 Which is more difficult to stop? A truck that weighs 2948.35 kg, traveling down the highway at 35m/s or a sports car that weights 1,418 kg traveling the same speed. p=mv A. The Truck. Truck is 103,192.25 kg m/s Car is 49,630 kg m/s

Projectile Pathways Truck is 103,192.25 kg m/s Car is 49,630 kg m/s

Kicked ball (has more velocity than the throw) Projectile Pathways In your spiral, with colors draw the parabolas of each different type of throw. Furthest throw Most curve Least curve Kicked ball (has more velocity than the throw) The purpose is show the difference in pathways Of a projectile being thrown. Truck is 103,192.25 kg m/s Car is 49,630 kg m/s

In Conclusion A projectile is any object upon which the only force is gravity. Projectiles travel with a parabolic trajectory due to the influence of gravity. There are no horizontal forces acting upon projectiles and thus no horizontal acceleration. The horizontal velocity of a projectile is constant. there is a vertical acceleration caused by gravity (9.8 m/s. The horizontal motion of a projectile is independent of its vertical motion.