PROJECTILE MOTION.

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Presentation transcript:

PROJECTILE MOTION

Projectile Motion A projectile is any object thrown/projected into the air, moving under influence of gravity. A projectile can be a basketball, a soccer ball, a stone, an arrow, a human cannonball at a circus, a frog hopping, or even a long jumper at the Olympic game.

Vocabulary Projectile : The object being launched/thrown or projected. Trajectory : The path that the projectile follows. Range: The horizontal displacement of the projectile. Maximum Height: The highest vertical displacement.

Time of flight: The time from when the object is projected to the time it reaches the surface. Launch Angle: The angle at which the projectile launched. Projectile motion is two dimension motion.

Vertical Component: Vector which indicates the vertical velocity of projectile; V0y - Initial force. Horizontal Component: Vector which indicates the horizontal velocity of a projectile. V0x

HORIZONTAL Velocity COMPONENT Never changes, it is constant No accelerated ax=0 Not influence by gravity

Changes MAGNITUDE and DIRECTION VERTICAL Velocity COMPONENT Changes MAGNITUDE and DIRECTION Accelerated motion; acceleration is – 9.8m/s Influence by gravity As Projectile moves up - MAGNITUDE of velocity DECREASES and its direction is UPWARD. As Projectile moves down - MAGNITUDE INCREASES and the direction is DOWNWARD.

Explain why an object projected horizontally and dropped vertically simultaneously will reach ground at the same instant?

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Example A place kicker kicks a football with a velocity of 20.0 m/s and at an angle of 53 degrees. (a) How long is the ball in the air? (b) How far away does it land? (c) How high does it travel? vo=20.0 m/s q = 53