DCA Review: Speed, Velocity,Acceleration and graphs

• There are 3 words that we use to describe motion

• Speed, Velocity and Acceleration

• What is speed?

• How do we describe the speed of objects?

• Speed is how fast an object is moving

• We use terms like miles per hour, meters per seconds. (mph and m/s)

• What is velocity?

• What is an example of velocity?

• Velocity is speed with direction.

• An example of velocity is: A dog runs 5 m/s going left.

• The speed of the dog is 5m/s and the direction of the dog is "left".

• What is acceleration?

• Give an example of acceleration.

• 
  

• Acceleration is: speed up, slow down, or change direction.

• Example of acceleration: A car is driving 50 mi/hr and begins to drive at 60 mi/hr.

• Example of acceleration: A car is driving straight and then makes a right turn.

• To calculate speed you divide the distance by time.

• Speed= distance/time

• Units of time are usually: m/s, km/s, km/hr, m/min.

• There are two types of motion graphs.

• Speed graphs

• Acceleration graphs

This graph has distance on the Y-axis. You will use terms like Constant Motion, Not Moving, and Constant Motion going back in this type of graph.

This graph has Speed on the Y-axis. You will use terms like Speed Up, Constant Motion, and Slow Down in this type of graph.