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Vector Quantity A quantity in physics, such as force, that has both magnitude and direction. Scalar Quantity A quantity in physics, such as mass, volume, and time, that can be completely specified by its magnitude, and has no direction. Vector An arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity. Resultant The vector sum of two or more component vectors. Component One of the vectors, often mutually perpendicular, whose sum is resultant vector. Any resulant vector may be regarded as the combination of wo or more components. Resolution The process of resolving a vector into components. In optics, a measure of how well closely adjacent optical images are disinguished. Projectiles Any object that moves through the air or through space, acted on only by gravity (and air gravity resistance, if any). Satellite An object that falls around earth or some other body rather than falling into it. free fall when the only force acting on an object is gravity projectile an object in free fall is know as a same rate neglecting air resistance all objects fall at the _________ _______ 9.8 m/s2 acceleration due to gravity (g) zero initial velocity drop 9.8 m/s if you drop an object, its speed will increase ______ every second initial velocity throwing an object downward is just like dropping an object, only with _____ _________ upward, downward when you throw an object up, it has _______ initial velocity and ______ acceleration 9.8 m/s you throw a ball straight up as it rises the ball slows down by _______ each second zero you throw a ball straight up when it reaches the top of its path the ball's speed is... 9.8 m/s you throw a ball straight up as it falls, the ball's speed increases by _________ each second. 9.8 m/s2 downward you throw a ball straight up the entire time the ball's acceleration is... same you throw a ball straight up it takes the ball the _______ amount of time to rise as to fall speed you throw a ball straight up the ball returns to you hand with the same _____ it left with down, vertical because gravity pulls straight ______ it only affects the ____________ motion of a projectile. stays constant the horizontal velocity of a projectile always... free fall the vertical velocity of a projectile acts like an object in... parabola the curved path followed by a projectile under the influence of constant gravity only time the only thing that can cross the line of the columns of horizontal and vertical is.... zero horizontal acceleration always because the ball is in free fall 90 degrees to give a projectile max height launch it at an angle of... 45 degrees when launching a projectile from level ground the angle that will result in max range is... range horizontal displacement complementary angles _____________ ________ will result in the same range air resistance frictional force air exerts on a moving object; acts opposite in direction to the object's motion hang time the total time the object is in the air velocity speed in a given direction acceleration change in velocity displacement distance and direction of an object's change in position from the starting point vector a quantity that has magnitude and direction` scalar magnitude only resultant a vector that is the sum of two or more other vectors