Per3_over

# Per3_over - Preview of Period 3: Motion and Forces 3.1 More...

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Preview of Period 3: Motion and Forces 3.1 More about Rates – Speed and Velocity What is the relationship among speed, distance and time of travel? What is the difference between speed and velocity? 3.2 Introduction to Forces What causes a change in velocity? 3.3 Changing Velocity: Acceleration What happens when an object accelerates? 3.4 The Relationship between Force, Mass, and Acceleration What determines an object’s acceleration? 3.5 Net Forces How do forces acting on an object combine? 3.6 The Forces Acting on Falling Objects What determines how fast an object falls? 3-1

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Act. 3.1: Speed and Velocity Speed = Distance traveled Time elapsed t D s = s = speed (in meters/second or miles/hour) D = distance (in meters or miles) t = time elapsed (in seconds or hours) If you drive for 2 hours at a constant speed and travel 120 miles, what is your average speed for the trip? t D s = To find the time t, begin by multiplying both sides of Equation 3.1 by t and canceling . t t D t s or t D s = = Then divide both sides by s and cancel. MPH 60 hour 1 miles 60 hours 2 miles 120 = = = 3-2 s D t or s D s t s = = (Ex 3.1) (Equation 3.1)
What is the Difference between Speed and Velocity? Speed is a rate indicating how fast an object moves. Velocity is a rate that specifies the speed AND the direction of motion. (Example 3.2 ) If you drive for 3 hours at a constant speed of 55 miles per hour, how far have you traveled? Solve Equation 3.1 for

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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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Per3_over - Preview of Period 3: Motion and Forces 3.1 More...

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