A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its velocity is _______. a. entirely.

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Presentation transcript:

A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its velocity is _______. a. entirely vertical b. entirely horizontal c. both vertical and horizontal d. zero e. not enough information given to know.

A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its acceleration is _______. (Neglect the effects of air resistance.) a. entirely vertical b. entirely horizontal c. both vertical and horizontal d. zero e. not enough information given to know.

At what point in its path is the horizontal component of the speed of a projectile the smallest? a. The instant it is thrown. b. Halfway to the top. c. At the top. d. As it nears the top. e. As it nears the end of its path. f. It is the same throughout the path.

At what point in its path is the vertical component of the speed of a projectile the smallest? a. The instant it is thrown. b. Halfway to the top. c. At the top. d. As it nears the top. e. As it nears the end of its path. f. It is the same throughout the path.

Roll a bowling ball off the edge of a table Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity ___. a. decreases b. remains constant c. increases

A bullet is fired horizontally and hits the ground in 0. 5 seconds A bullet is fired horizontally and hits the ground in 0.5 seconds. If it had been fired with twice the speed in the same direction, it would have hit the ground in ____. (Assume no air resistance.) a. less than 0.5 s. b. more than 0.5 s. c. 0.5 s.

Two projectiles are fired at equal speeds but different angles Two projectiles are fired at equal speeds but different angles. One is fired at angle of 30 degrees and the other at 60 degrees from the horizontal. The projectile to hit the ground first will be the one fired at (neglect air resistance) ____. a. 30 degrees b. 60 degrees c. both hit at the same time

A projectile is launched at an angle of 15 degrees above the horizontal and lands down range. For the same speed, what other projection angle would produce the same downrange distance? a. 30 degrees. b. 45 degrees. c. 50 degrees. d. 75 degrees e. 90 degrees.

Consider the trajectory diagram shown below for a non-horizontally launched projectile. On the diagram, draw vector arrows representing the vx and vy velocity components during the course of the motion. The length of the arrows should represent the magnitude of the velocity components. Label each component. (Note that the velocity components are already shown for the first position.)