Recognizing, Describing, and Measuring Motion

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Presentation transcript:

Recognizing, Describing, and Measuring Motion

Recognizing Motion An object is in motion when its distance from another object is changing. Whether an object is moving or not depends on your point of view. It is also know as your reference point.

Motion and Reference Points An object is in motion if it changes position relative to a reference point. A reference point is a place or object used for comparison to determine if something is in motion.

Measuring Motion Speed is the distance an object travels per unit of time. If it takes you 1 hour to drive a total of 60 miles, then how fast were you going? 60 mph (miles per hour) To calculate speed: Divide the distance by the time

Average Speed Most objects do not move at constant speeds for very long. Think about how many stops you have to make on your way to school each day. To calculate average speed, is the total distance divided by the total time.

Velocity Knowing the speed of an object will not tell you everything about its motion. Velocity is the SPEED & DIRECTION of and object. Velocity changes if either speed or direction changes. With storms, you need to know the velocity of its motion !

Graphing Motion

Acceleration Acceleration is the rate at which velocity changes. It refers to increasing speed (of course), decreasing speed (deceleration), or changing direction.

Calculating Acceleration To determine the acceleration of an object, you must calculate the change in velocity during each unit of time. The formula for this is: Acceleration = Final velocity –Initial velocity/Time

Calculating Acceleration Lets Try: A car advertisement states that a certain car can accelerate from rest to 90 km/h in 9 seconds. Find the car’s average acceleration. An bird accelerates from 15 m/s to 22 m/s in 4 seconds. What is the eagle’s average acceleration?