Free Fall MHS.

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Presentation transcript:

Free Fall MHS

Objectives Use kinematic equations to solve problems for objects moving at a constant acceleration in free fall.

Air Resistance If we drop a ball and a sheet of paper, it is obvious they don’t fall at the same rate. If we could remove all the air from the room, however, we would find that they fall at the same rate. We will analyze the motion of the objects by neglecting air resistance (a form of friction) for the time being.

Acceleration Due to Gravity Near the surface of Eaarth, objects accelerate downward at a rate of 9.81 m/s2. We call this acceleration the acceleration due to gravity (g). More accurately, it is called the gravitational field strength. As you move further away from Earth, g decreases.

Objects Falling From Rest Objects starting from rest have an initial velocity (vi) of 0. Since the object’s initial motion is down, call down the negative direction. Acceleration is -g.

Sample Problem - Falling How far will a brick starting from rest fall freely in 3.0 seconds? [Neglect air resistance.]

Objects Launched Upward Must examine the motion of the object on the way up and down. Since the object’s initial motion is up, call up the positive direction. Acceleration is –g. At highest point, the object has a velocity of 0. Symmetry of motion.

Sample Problem A ball thrown vertically upward reaches a maximum height of 30 meters above the surface of the Earth. At its maximum height, the speed of the ball is __________.

Sample Problem A basketball player jumped straight up to grab a rebound. If she was in the air for 0.80 seconds, how high did she jump?

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