MOTION SPEED VELOCITY PS 8 Notes Part 1
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MOTION, SPEED, & VELOCITY PS. 8 Notes Part 1
Greetings and Salutations • Mastery Objective: • Today, I will investigate speed, velocity, acceleration, and Newton’s Laws of Motion, • So I can describe the motion of objects. • I know I have it when I calculate speed correctly.
What are Motion, Speed, and Velocity? • Motion takes place when an object changes its position in relation to a specific reference point. • The reference point could be the whiteboard and as the students move from one desk to another, motion occurs. • Speed is how fast an object is moving or the change in position of an object per unit of time. Speed = distance/time (s = d/t)
What are Motion, Speed, and Velocity? • How fast does a car move when it travels 60 m for 4 seconds? S = d/t d = 60 m t=4 s S = 60 m/4 s S = 15 m/s • Don’t forget units!!!!!!!
What are Motion, Speed, and Velocity? • Velocity is speed with a direction. • To measure velocity, scientists look at the speed of an object and the direction in which it is moving. • An object’s velocity will change if there is a change in speed, in direction, or both.
What is Acceleration? • Acceleration is the change in velocity per unit of time, or how quickly velocity changes. • An object moving with constant velocity has no acceleration. • Deceleration (or negative acceleration) occurs when an object accelerates due to a decrease in speed.
What is Acceleration? • Examples of acceleration include: • A bus leaving the bus lane (increase in speed). • A student who is running down the hall slows to a walk when a teacher tells him to stop running (decrease in speed). • A student winding his way through a crowded hallway (change in direction). • People on a Ferris wheel or the horses on a carousel.
What is Acceleration? • When plotted on a distance-time graph, acceleration always results in a curved line.
Distance, Time, and Speed Practice Problems • Complete the practice problems on the worksheet before the end of class. • Use the calculators provided. • Turn in your sheet to the mailbox!