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					Motion
Speed, Velocity, and Acceleration

Frames of Reference
 



The object or point from which movement is determined Movement is relative to an object that appears stationary Earth is the most common frame of reference

Questions
 What

is the frame of reference for the sunset?  What is a frame of reference?  What is the most common frame of reference?

Question
 When

can you determine how fast you are going in a jet plane?

Motion


Motion is a change in position relative to a frame of reference  Speed is the distance traveled in a given amount of time  Speed=distance  time

Speed
 The

units for speed:  meters/second (m/sec)  kilometers/hour (km/hr)  Speed that does not change is constant speed

Average speed
Total distance divided by the total time  Formula:  Total distance total time


Velocity
Speed in a given direction  Velocities in the same direction combine by adding  Velocities in different directions combine by subtracting


Interesting fact
 Rockets

are launched in the same direction of the earth’s rotation to get an extra boost of 1800 km/hr to its speed

Questions  What is motion?  What is speed? How is it calculated?  What is average speed?

Questions
 How

is velocity different from speed?  Which two factors determine an object’s velocity?

Acceleration
 The

change in velocity  Acceleration is measured in m/sec/sec or m/sec2  Formula is:  (final velocity - original velocity)/time

Deceleration vs. Acceleration
A

decrease in velocity is deceleration or negative acceleration  A distance-time graph for acceleration is always a curve

Centripetal Acceleration
 Acceleration

directed toward the center of circular path

Questions
 What

is acceleration?  What is the shape of a distance-time graph for acceleration?  What is centripetal acceleration?

Momentum  Momentum is equal to the mass of an object times its velocity  momentum= mass x velocity

Conserving Momentum
 The

law of conservation of momentum states that the total momentum is NOT lost, only transferred

What is momentum?  What happens to momentum as the mass of a moving object increases?  What is the formula for momentum?  What is the law of conservation of momentum?


Questions


				
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posted:4/23/2008
language:Galician
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