Gravity and Acceleration

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Presentation transcript:

Gravity and Acceleration Objects near the surface of Earth fall to Earth due to the force of gravity. Gravity is a pulling force that acts between two or more masses. Air resistance is a friction-like force that opposes the motion of objects that move through the air. Ignoring air resistance, all objects will accelerate towards Earth at the same rate. The acceleration due to gravity is 9.8 m/s2 downward = - 9.8 m/s2

Calculating Motion Due to Gravity To analyze situation where objects are accelerating due to gravity, use the same equations you’re already familiar with: In these equations, the acceleration ( ) is 9.8 m/s2 [downward]. Example: Suppose a rock falls from the top of a cliff. What is the change in velocity of the rock after it has fallen for 1.5 s? Assign “down” as negative (-). Since down is negative (-), the change in the rock’s velocity is 15 m/s [down].

Calculating Motion Due to Gravity Try the following acceleration due to gravity problems. What is the change in velocity of a brick that falls for 3.5 s? A ball is thrown straight up into the air at 14 m/s. How long does it take for the ball to slow down to an upward velocity of 6.0 m/s? A rock is thrown downwards with an initial velocity of 8.0 m/s. What is the velocity of the rock after 1.5 s? 34 m/s [downward] 0.82 s 23 m/s [downward]