1. Motion SWBAT define speed and acceleration; relate acceleration to change in speed; calculate distance, speed, and acceleration

2. Speed What 2 things do you need to know to calculate the speed of an object? Distance How far did the object travel? Time How long did it take to travel the measured distance?

3. Get your Lab Notebook Title: Calculating Speed and Acceleration We will periodically do some calculations during today’s lesson I will give you an example and in your groups you will answer the given questions using the given formulas

4. Speed Average speed is calculated by dividing the distance traveled by the time it takes to travel that distance. Average speed (m/s) = distance traveled (m) time (s) S = d/t Riding your bike, it takes you 30 minutes to get to your friend’s house, which is 9 km away. What is your average speed? In your lab notebook calculate the following: If an airplane travels 1,350 km in 3 hours, what is its average speed? Determine the average speed, in km/h, of a runner who finishes a 5 km race is 18 minutes.

5. Speed Instantaneous speed the speed of an object at any instant of time. How are instantaneous speed and average speed different? An average is a calculation of multiple measures over a given time, instantaneous speed shows how fast you are going at a given moment, which may not be the same as your average speed. Constant speed when the instantaneous speed of an object doesn’t change, it is the same as the average speed. What do you need to calculate the distance of an object? Average speed and time Distance = Average speed x Time D=st

6. Calculating Distance It takes your family 2 hours to drive to an amusement park at an average speed of 73 km/h. How far away is the park? In your lab notebooks solve the following problems in your groups You and your friend walk at an average speed of 5 km/h on a nature walk. After 6 hours, you reach the ranger station. How far did you travel? An airplane flying from Boston to San Francisco traveled an average speed of 830 km/h for 6 hours. What distance did it fly?

7. Speed Velocity – the speed of an object and its direction of motion. Acceleration – the change in velocity divided by the time needed for the change to occur. Acceleration (m/s 2 )= final speed – initial speed (m/s) time (s) a = (s f – s i )/t

8. Calculating Acceleration You are sliding down a snow covered hill at a speed of 8 m/s. There is a drop that increases your speed to 18 m/s in 5 seconds. Find your acceleration. In your lab notebooks calculate the following: The roller coaster you are on is moving at 10 m/s. 5 seconds later it does a loop-the-loop and is moving at 25 m/s. What is the roller coasters acceleration over this time? A car you’re riding in is slowing down for a stoplight. It was initially traveling at 16 m/s and comes to a stop in 9s. What is the cars deceleration?