Projectiles- A projectile is any object that is in a state of freefall, or in other words an object that is only acted upon by the force of gravity (we.

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Presentation transcript:

Projectiles- A projectile is any object that is in a state of freefall, or in other words an object that is only acted upon by the force of gravity (we are assuming no air resistance in this class!)

Examples of projectiles

Projectile motion In the absence of air resistance, a projectile will have a constant horizontal velocity and thus a horizontal acceleration of zero (ax = 0) The projectile will be accelerated downward by the force of gravity. The vertical acceleration of the projectile will be –9.8 m/s2 (ay = -9.8 m/s2 )

Projectile motion Mr larson is in the cannon

***Projectile motion*** It is important to realize that the horizontal component of projectile motion remains constant.

Projectile Equations Y = Vyit + 1/2at2 Vyf = vyi + at Vyf2 = vyi2 + 2ay X =vxit and vxi = vxf  notice that there is no acceleration. Why? Vyi = visinq Vxi = vicos q

Example A cannon is fired horizontally at 20 m/s. Notice what happens to its horizontal velocity and its vertical velocity.

Example of a horizontally launched projectile A cannon is fired horizontally at 20 m/s on a 10 m tall cliff. How long will the cannon ball be in the air? How far from the base of the cliff will the cannon ball fall?

Projectile motion Compare the horizontal motion of the gravity free path and the projectile motion. Compare the vertical motion and the projectile motion.

Projectile launched at an angle example

Projectile launched at an angle from ground level The raider qb(greg jones) passes a football with a velocity of 3 m/s at an angle of 10 degrees with the ground. How high does the football go? How long is the football in the air? How far does the football travel?

Example problem Kristen throws adam off of a cliff that is 15 m high. she throws adam with a velocity of 12 m/s at an angle 33 degrees. How long is adam in the air? Find Adam’s range and max height.

Vector addition notes Add head to tail. The resultant is placed from the tail of the first vector to the head of the last vector. Example1: A cat runs 4 m S and 2 m N. Find the resultant displacement. Example2: An A-10 thunderbolt II (warthog) flies east with a velocity of 40 m/s. A strong wind pushes it north with a velocity of 10 m/s. Find the resultant velocity.

Example2: An A-10 thunderbolt II (warthog) flies east with a velocity of 40 m/s. A strong wind pushes it north with a velocity of 10 m/s. Find the resultant velocity. Diagrams from www.glenbrook.k12.il.us/gbssci/phys