Motion in one dimension

Lesson 1

Standard

HS-PS2-1 Analyze data to support the claim that Newton’s second law of motion describes the

mathematical relationship among the net force on a macroscopic object, its mass,

and its acceleration

Leaning objectives

I can differentiate between average speed and average velocity by calculating the distance, displacement, and time

Success criteria

• Describe speed and velocity
• Calculate speed and velocity
• Design a position- time graph

New Vocabulary

average velocity

average speed

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Speed

• Speed (s) – Rate at which an object is moving.
• speed = distance / time
• s = d/t
• Like distance, speed does not depend on direction.

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• Average speed = average distance / time

Velocity

• Velocity (v) – speed with direction.
• velocity = displacement / time
• v = Δd / t
• Has magnitude and direction!
• Magnitude – a measure that has a value

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Velocity will be negative if the object is moving to the left

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Practice

• A man moved 20 m from point A to B in 20 seconds . After that he moved 16 m from point B to C in 12 seconds . he figured out the he forgot his wallet on point B So he returned back in 10 seconds.
• Find the distance covered.
• Find the displacement.
• What is the speed ?
• What is the velocity ?

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Classwork