Per4_over

# Per4_over - Preview of Period 4: Gravity, Mass, and Weight...

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Preview of Period 4: Gravity, Mass, and Weight 4.1 Center of Gravity Where does the force of gravity appear to act on an object? 4.2 Center of Mass How can you find the center of mass of an object? Why is the location of the center of mass useful? 4.3 and 4.4The Acceleration of Gravity How does the gravitational force act upon objects? How large is the acceleration of gravity 4.5 Mass and Weight What is the difference between mass and weight? 4-1

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Act. 4.2: The Center of Mass The center of mass of an object is the point at which the force of gravity acts on the object. The center of mass of an object with a uniform distribution of mass is at its center: How can you find the center of mass of an irregularly shaped object? Where is your center of mass? 4-2
Act. 4.1: The Center of Mass What happens when the center of mass of an object is not supported? 4-3

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Act. 4.3: The Gravitational Force and the Acceleration of Gravity Experience tells you that a book falls much faster than a sheet of paper. How can you make them fall at the same rate? The trick is to reduce air resistance. As an object moves through air, it collides with air molecules. Each molecule exerts a force on the object, slowing its velocity slightly. How can you reduce air resistance on the sheet of paper? 4-4 The force of gravity pulls the paper down. Collisions with air molecules exert a force up on the paper.
Act. 4.3: Forces on Falling Objects A falling object accelerates due to the force of gravity pulling it downward. Objects near the Earth accelerate at the

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## This note was uploaded on 06/11/2011 for the course PHYSICS 103 taught by Professor Staff during the Spring '10 term at Ohio State.

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Per4_over - Preview of Period 4: Gravity, Mass, and Weight...

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