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Physics_50_Proficiency_Test_2s - Physics 50 Proficiency...

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Physics 50 Proficiency Test 2 (sample) (Time: 15 minutes) 25 points By Todd Sauke Name ________________________ Section # ________ When an object flies freely (with no impedance, obstruction or wind resistance) in the presence of a constant gravitational field, the motion is called "projectile motion". Near the surface of the Earth, the gravitational field is approximately constant and results in projectile motion of freely flying bodies with a constant acceleration of 9.80 m/s 2 (directed downward) when air resistance can be neglected. The kinematic equations for constant acceleration motion in the x direction are: (For constant acceleration motion in the y direction, we can simply substitute y for x .) v = v 0 + a t x - x 0 = ½(v 0 +v) t v 2 = v 0 2 + 2a ( x x 0 ) x = x 0 + v 0 t + ½ at 2 A football player kicks (at t = 0) a football (initially on the ground) down the football field toward the goal post with an initial speed of 27.8 yards per second at an angle of 52 º above the horizontal. The football subsequently strikes the horizontal field goal cross bar, which has a height of 10 feet.
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