chapter 04 2008 (PPTminimizer)

# chapter 04 2008 (PPTminimizer) - Basic Physics Basic...

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Basic Physics Basic Physics

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Describing Motion Lecture Objectives 1. Distinguish between speed, velocity, and acceleration. 2. Name three ways to accelerate. 3. What is the acceleration of gravity? 4. How does the acceleration of gravity depend on the mass of a falling object?
Distinguish between speed, velocity, and acceleration. Name three ways to accelerate.

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Objects in Motion Objects in Motion Precise definitions to describe motion: Speed : Rate at which object moves distance m speed = units of s time       example: speed of 10 m/s Velocity : Speed and direction example: 10 m/s, due east Acceleration : Any change in velocity ( either speed or direction ) in units of distance/time 2 (m/s 2 ) In general, quantities that have both size (magnitude) and direction are called vectors .
What is the acceleration of gravity?

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The Acceleration of Gravity… The Acceleration of Gravity… is the acceleration an object undergoes in free fall . “Free fall” is the absence of all forces except gravity, accelerating objects down. On Earth it has a value of 9.8m/s 2 will often use 10m/s 2 In free-fall, vertical acceleration is independent of any horizontal motion.
How does the acceleration of gravity depend on the mass of a falling object?

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Galileo’s Law of Falling Bodies Galileo’s Law of Falling Bodies IT DOESN”T! In free fall , everything accelerates downward at the same constant acceleration . Mass does not matter!
The Acceleration of Gravity ( The Acceleration of Gravity ( g g ) )

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Thought Questions Thought Questions In each situation, what direction is the object accelerating? If there is no acceleration, state so . 1. A cart dropped down a ramp. 2. A pen tossed into the air, while it is going up . 3. The pen when it is going back down 4. The pen when, for an infinitesimal fraction of a second, is stationary at the top of its motion. 5. A ball twirled around on a string. 6. A rock drifting freely through interstellar space
Review of Lecture Objectives 1. Distinguish between speed, velocity, and acceleration. 2. Name three ways to accelerate. 3. What is the acceleration of gravity? 4. How does the acceleration of gravity depend on the mass of a falling object?

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Newton’s Laws Lecture Objectives 1. What is Force ? 2. What causes objects to accelerate? 3. What is the difference between weight and mass. 4. What are Newton’s three laws of motion?
What is Force? What causes objects to accelerate?

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Forces Force is a push or pull on an object (unit of Newtons N, or pounds lb) Forces are vectors, and if they act in different directions can “cancel” or “balance” resulting in zero net force. The
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## This note was uploaded on 04/22/2010 for the course BUS 255 taught by Professor Mcgee during the Spring '10 term at Aarhus Universitet.

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chapter 04 2008 (PPTminimizer) - Basic Physics Basic...

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