Describing motion is done using both words and graphs. The wording can be confusing but the graphs always give you a picture of what is happening. Remember that motion is a change in position measured by distance and time. Making a graph showing distance and time can tell you a great deal about the motion of an object. Look at the axes below. Time is always plotted along the X-axis and Distance is always plotted along the Y-axis. Time is usually in seconds but can also be in minutes or hours. Distance is usually in meters but can be in feet or inches. Questions: 1. How many seconds are recorded on the graph? 2. How many feet are recorded on the graph? 3. What distance was traveled after 2 seconds? 4. How long did it take the object to travel 9 feet?

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

What energy transformations occur each time the skateboarder rolls up the ramp?