 You will be able to explain the relationship between motion and a frame of reference  You will be able to relate speed to distance and time  You will be able to distinguish between speed and velocity  You will be able to solve problems related to time, distance, displacement, speed, and velocity

 Motion is an object’s change in __________ relative to a reference point.  What are some examples of motion in the world around you?  How do we know when an object is moving?

 Is more than just observing an object  You have to observe the object in relation to a stationary object  This stationary object is called a reference point or frame  ___________ is a common reference point  When your objects changes position in comparison to a reference point, then it is in motion

 Using the mountain as a reference point, we can see that the balloon is in motion  We can also give reference directions such as north, south, east, west, up or down  How is the balloon moving?

 Distance measures the path taken by an object  It doesn’t have to be in a straight line or in a specific direction  Example: › If I walk home from school and then come back I have covered a distance of 5 blocks in total  Displacement is the change of an object’s position  It must be in a straight line and it must have direction  Example: › If I walk home form school and then come back, my displacement is zero towards home

AAAA tiger paces in her cage: first 8 ft. to right, then 8 ft. to the left, and finally 8 ft. back to the right WWWWhat is the total distance the tiger has traveled? WWWWhat is the displacement of the tiger?

 You know from experience that some objects move faster than others  Speed describes how fast an object moves  Speed measurements involve distance and time  So speed is measured in units of meters per second (m/s)  When an object covers equal distances in equal amounts of time, it is moving at a _________________

 Speed can be studied with graphs and equations  It can also be determined from a distance- time graph  Time is the ___________ variable and distance is the ______________ variable

 When speed is constant, a straight line is formed  Why?  The slope of any distance- time graph gives the _______ of the object  An object at rest is a flat line with a slope of _________

 Is describing the motion of an object moving at changing speeds  It is found by dividing distance by time  speed = distance time time  r = d t  Describes the speed of an object at any given point in time  Example: a car’s speedometer

 Describes both the speed and the direction of motion  It is found by dividing displacement by time  v = d velocity = displacement ttime ttime

 Suppose a lion moves due east at different speeds so that it travels 25 km in 4.0 hours. What is the lion’s average speed? What is its average velocity?  What would the lion’s average velocity be if it traveled 15 km due north in 2 hours and 15 minutes?

 When an object changes position in comparison to a stationary reference point, the object is in motion.  The average speed of an object is defined as the distance the object travels divided by the time of travel.  The distance-time graph of an object moving at constant speed is a straight line.  The slope of the line is the object’s speed.  The velocity of an object consists of both its speed and its direction of motion.