Chapter 2 - Tagged.pdf

Physics 1000 – 001/002 Speed, Velocity and Acceleration Motion  Speed Speed As a first definition, speed is distance traveled per unit time Speed = Distance / Time  Speed Speed As...

Physics 1000 – 001/002 Speed, Velocity and Acceleration Motion  Speed Speed As a first definition, speed is distance traveled per unit time Speed = Distance / Time  Speed Speed As a first definition, speed is distance traveled per unit time Speed = Distance / Time Average Speed Average speed = Total distance traveled / Time interval  Speed Speed As a first definition, speed is distance traveled per unit time Speed = Distance / Time Average Speed Average speed = Total distance traveled / Time interval Instantaneous Speed The speed of an object over a very small time interval  Velocity Velocity Velocity is speed with a direction Quantities that have both a magnitude (size) and a direction are called vectors Speed is the magnitude of velocity  Velocity Velocity Velocity is speed with a direction Quantities that have both a magnitude (size) and a direction are called vectors Speed is the magnitude of velocity Average Velocity Average velocity = Total displacement / Time interval  Velocity Velocity Velocity is speed with a direction Quantities that have both a magnitude (size) and a direction are called vectors Speed is the magnitude of velocity Average Velocity Average velocity = Total displacement / Time interval Constant Velocity Constant velocity requires constant speed and constant direction  Acceleration Where velocity is the change in position over time, acceleration is the change in velocity over time  Acceleration Where velocity is the change in position over time, acceleration is the change in velocity over time Velocity = Change in position / Time interval Acceleration = Change in velocity / Time interval , average acceleration is  Acceleration Where velocity is the change in position over time, acceleration is the change in velocity over time Velocity = Change in position / Time interval Acceleration = Change in velocity / Time interval , average acceleration is Deceleration can be thought of as negative acceleration, but is not commonly used as a term in physics  Acceleration Consider a car traveling along a straight highway at 40 mph that speeds up to 60 mph during a time interval of 20 s. What is the car’s average acceleration?  Acceleration Consider a car traveling along a straight highway at 40 mph that speeds up to 60 mph during a time interval of 20 s. What is the car’s average acceleration?  Acceleration Consider a car traveling along a straight highway at 40 mph that speeds up to 60 mph during a time interval of 20 s. What is the car’s average acceleration?  Acceleration Consider a car traveling along a straight highway at 40 mph that speeds up to 60 mph during a time interval of 20 s. What is the car’s average acceleration?  Acceleration Consider a car traveling along a straight highway at 40 mph that speeds up to 60 mph during a time interval of 20 s. What is the car’s average acceleration?  Free Fall When an object is acted on by gravity alone, it is said to be in free fall No friction, including air resistance  Free Fall When an object is acted on by gravity alone, it is said to be in free fall No friction, including air resistance On Earth, acceleration due to gravity is Units of acceleration are meters per second squared Can also be thought of as meters per second, per second For this class, we will round this number to  Free Fall We know that Acceleration = Velocity/Time This can be rewritten as Velocity = Acceleration x Time In the case of free fall, acceleration is gravity, so To calculate distance traveled in free fall, Where d=distance, g=gravity, t=time  Homework Read Chapter 2 Conceptual Questions: 12, 14, 18, 22, 24, 28, 34, 38, 44, 48 Exercises: 58, 60, 62, 72, 78