2 Instructional Objectives: Students will be able to:Define Projectile MotionDistinguish between the different types of projectile motionApply the concept to a toy car and measure its velocity
3 Define these terms: Components of a vector Projectile Projectile motionResolutionResultantScalarVector
4 Projectile Motion Two-dimensional motion of an object Vertical Horizontal
5 Examples:Ball being thrown, water coming out of the hose, a bullet fired from a gun, arrow shot from a bow, cannonballs, fountains.
6 Types of Projectile Motion HorizontalMotion of a ball rolling freely along a level surfaceHorizontal velocity is ALWAYS constantVerticalMotion of a freely falling objectForce due to gravityVertical component of velocity changes with timeParabolicPath traced by an object accelerating only in the vertical direction while moving at constant horizontal velocityBullet!
7 Examples of Projectile Motion Launching a Cannon ball
8 RANGE is the horizontal displacement of the projectile (x) MAXIMUM HEIGHT is the vertical displacement of the projectile (y)
9 QuestionAt the highest point what can be said about the vertical velocity?
19 Types of problems The problems we do break down to four basic types Find the time to hit the ground.Find the range (displacement in the x direction)Find the maximum HeightFind the initial velocity (with or without angle)
20 REMEMBER:1. the horizontal velocity of a projectile is constant (never changing in value), 2. there is uniform vertical acceleration caused by gravity; its value is 9.8 m/s2 3. the vertical velocity of a projectile changes by ~10 m/s each second, the horizontal motion of a projectile is independent of its vertical motion.
21 Horizontal MotionA cannon is on the top of a 100 m high hill. If the cannon shoots a cannonball at 50 m/s. What is the distance that the cannonball will travel?
26 Horizontal Motion 3The same baseball from the previous problem keeps rolling down the hall at the same speed. It rolls over the top of a ledge and hits the ground 3 meters from the ledge. How tall is the ledge?
27 Factors Affecting Projectile Motion What two factors would affect projectile motion?AngleInitial velocityInitial VelocityAngle
28 Class ExerciseAn object is fired from the ground at 100 meters per second at an angle of 30 degrees with the horizontalCalculate the horizontal and vertical components of the initial velocityAfter 2.0 seconds, how far has the object traveled in the horizontal direction?How high is the object at this point?