Unit 2: Projectile Motion

Unit 2: Projectile MotionUp and DownLeft and Right

Objects Moving In TWO dimensions Horizontal and VerticalProjectiles must have displacement, and velocity and accelerationEach has horizontal (x) and vertical (y) components

Projectiles will have constant vertical acceleration 9.81m/s2 on Earth

Projectiles will have constant horizontal velocity

The horizontal displacement (dx) is called the range

For projectiles, the equations are used twice Horizontal components of motion

vertical components of motion

Objects fired HorizontallyInitial horizontal velocity is LOCKED at a single valueInitial vertical velocity is ZEROHorizontal Acceleration is ZERO Vertical Acceleration is gDisplacements, times, and velocities can be determined using equations for motion

Horizontal projectiles will accelerate downward at the same rate as something that is dropped from the same height

Therefore they hit the ground at the same time! A furry bunny rabbit is dropped out of a plane flying horizontally at an altitude of 490 m with a velocity of 250 m/s. The bunny rabbit falls freely to a concrete patio on the ground. Calculate the time required for the bunny rabbit to hit the ground. Calculate the horizontal distance covered by the bunny rabbit from drop point to impact point.Example 1: Horizontal ProjectileExample 1: Horizontal Projectile (Solution)

Example 2: Horizontal Projectile A Chinchilla is released from a plane from 100 m above the ground. The plane was flying along at 22.5 m/s East. How far from the release point above the ground will the ugly rodent land?

Example 2: Horizontal Projectile (Solution)

Warm Up #82/10A squirrel is thrown horizontally at 15m/s from the top of a cliff that is 44 m high. How long does it take for the squirrel to hit the ground How far from the base of the cliff does the squirrel hit the ground?

How fast is it falling vertically the instant before it explodes all over the ground?11Example: Splitting VelocityWarm Up #92/11A prairie dog is being chased by a deranged physicist. It runs away and jumps over the edge of a canyon because it is unintelligent. The rodent was running with a velocity of 10 m/s and it fell 200m to the valley floor. How long does it take for the ugly prairie dog to hit the ground How far from the base of the cliff does the rodent hit the ground?

What was the rodents horizontal velocity the instant before it explodes all over the ground?

Objects fired at AnglesInitial horizontal velocity is LOCKED at a single valuevix and viy are found with TRIGax = ZERO ay = -9.81m/s2Vertical Acceleration is gMax Height Vertical Velocity = ZERO (also flight time)

Draw diagrams of the situations!

45 degrees gives the HIGHEST RANGE!

To solve for any variable determine if it is horizontal or vertical Use only the horizontal OR only vertical components in an equation Objects launched at 45 will have a maximum horizontal distance (range)

Example: Angled Projectile 1A Vole is launched with a slingshot at an angle of 40 degrees. A radar gun clocks the flying rodent at 50 m/s.What is the rodents horizontal velocity?What is the rodents vertical velocity?What is the rodents total flight time?

Example 1: Angled Projectile (Solution Parts 1 and 2)Example 1: Angled Projectile (Solution Part 3)

A guinea pig is strapped to a missile and fired with an initial velocity of 300 m/s at an angle of 30.0 above the ground. After a flight time of 30.6 seconds the guinea pig returns to level ground and explodes.

Calculate the initial horizontal and vertical components of the velocity

Calculate the maximum height of the guinea pig above the ground Calculate how far from the launch site the guinea pig explodes

Example: Angled Projectile 2Warm Up #102/12A chipmunk was launched from a crossbow with an initial velocity of 44.7 m/s at an angle of 66 degrees above the horizontala) What was the maximum height reached by the rodent?b) How long did the chipmunk take to return to the launching height (0m)c) How far from the launch position did the chipmunk land and combust?

Your teacher kicks a woodchuck from ground level with an initial velocity of 27 m/s at 30 degrees above the horizontal. a) Find the hang time of the rodentb) Find the range (how far away it landed)c) What was the maximum height reached by the woodchuck?

Warm Up #11/