Motion. What is Speed? Speed- The distance an object is moving over a certain period of time Speed tells you how fast or slow an object is moving Instantaneous.

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Presentation transcript:

Motion

What is Speed? Speed- The distance an object is moving over a certain period of time Speed tells you how fast or slow an object is moving Instantaneous speed: the speed an object is travelling at a specific time Average speed: the speed of an object is the relationship between total distance and total time travelled Constant speed: object’s speed does not change; it remains the same

How do you Calculate Speed? Average speed = total distance / total time Speed= Distance divided by time Speed = d/t

Units we use to measure speed Could be –meters/seconds –Kilometers/hour

Speed Graph Example

More examples of graphs Car is traveling at a constant speed Car is not moving

What do these graphs represent?

What is Velocity? Velocity- is the speed of an object in a certain DIRECTION Example of Speed- A truck is travelling at 35 km/hr Example of Velocity- A truck is travelling at 35 km/hr heading northwest

Calculate Velocity Same as calculating speed Velocity= Distance/ Time in a certain DIRECTION

Units for Velocity Could be –meter/second going __________(Direction) –kilometers/hour going _______ (Direction)

Resultant Velocity Resultant velocity = true velocity If you are walking forward on a moving object (a bus), then you add together both velocities to calculate resultant velocity. If you are walking backward on a bus, you subtract your velocity from the bus’s velocity to calculate resultant velocity.

Examples of Resultant Velocity 2. The current is flowing in the same direction as the boat at 5 km/h 1. The boat is sailing west at 10 km/hr 3.What is its resultant velocity? km/hr + 5 km/hr = 15 km/hr

Examples of Resultant Velocity 2. The current is flowing in the opposite direction as the boat at 5 km/h 1. The boat is sailing west at 10 km/hr 3.What is its resultant velocity? km/hr - 5 km/hr = 5 km/hr

What is Acceleration? Acceleration- the change in velocity over a certain period of time The “speeding up” of an object The “slowing down” of an object The “changing direction” of an object

How do you Calculate Acceleration? The formula for calculating acceleration is: Acceleration = Final Velocity - Initial Velocity Final Time - Initial time

Acceleration Example Ex: A train stopped has a velocity of 0 m/s. It took the train 60 seconds to leave the station and reach a velocity of 30 m/s. What is the trains acceleration?

Solve it! Acceleration formula Final velocity - initial velocity / time 30 m/s - 0 m/s / 60 sec = 30 m/s / 60 sec =.5m/s/s.5 m/s 2

Units for Acceleration Could be –m/s/s or m/s 2 –km/h/h or km/h 2