Name: __________________________ Class: _____ Motion 11 Name: __________________________ Class: _____ Motion 11.1 Distance and Displacement Chapter 11

What are we going to learn? Methods of describing motion How can vectors be combined?

A story of motion... Once upon a time, 3 students (George, Harry, and William) were on their way to school. When asked the question, “How fast are your friends moving?” there were very different and conflicting answers from the students. George says that Harry and William are moving very fast. Harry says that George is moving but William is not. William says that George is moving but Harry is not. If everyone is telling the truth, how can this be? It’s all a matter of ___________________________... _________________________________________________________________________________________________________________________________

Frame of Reference Relative Motion Distance _________________ to describe motion __________________ and ___________________ A system of _____________ that are ______ _____________ with respect to __________________ Relative Motion _________________ in relation to a _______________________________________ Distance ___________ of the ________ between _____________________________

Distance Units Displacement ______________ for distance: ___________ (m) For very __________ distances: _________________ (km) For distances _______________ than meters: ___________________ (cm) Displacement ______________ from the __________________ and the length of a _____________________ from the starting point to the __________________ Gives information both about ___________________ an ________________ from a given point and in what ________________ the object is from that point Displacement is a ______________

Vectors Vector Addition A quantity that has ________________ and _________________ (can be __________, _____________, or _____________) Add displacements using ______________________ Vector Addition When two vectors have the ____________________, you can ____________________________________ When two vectors are in ________________ _________________, ________________ one ___________________ from the other Ex: A police officer going the speed limit of 45 mph clocks you going in the opposite direction at 92 mph. _____________________________________

Since the vehicles are going in _________________ _________________, subtract the police officer vector from your vehicle vector...the ________________ is your _______________________________ 92 mph – 45 mph = 47 mph (_________________________________________) When ____________________ vectors have _______________________________, combine them by ___________________ ______________________________________ is the ______________ vector

Review Questions What two things must you know to describe the motion of an object? ________________________________ True or false? A frame of reference is not necessary to describe motion accurately and completely. _______________ Five blocks south is an example of a displacement. _____________________________________________ Circle the letter of the SI unit best suited for measuring the length of a room in your home. a. kilometers b. meters c. centimeters d. millimeters

Imagine that you are a passenger in a car Imagine that you are a passenger in a car. Circle the letter of the best frame of reference you could use to determine how fast the car is moving relative to the ground. a. the people sitting next to you in the backseat b. the driver of the car c. a van traveling in the lane next to your car a sign post on the side of the road What would your total displacement be if you walked from your front door, around the block, and then stopped when you reached your front door again? a. one block b. two blocks c. the entire distance of your trip d. zero

Compare and contrast distance and displacement. _________________________________________________________________________________________________________________________________________________________________________________________________________________________ A vector is a quantity that has both ______________ and ______________. The vector sum of two or more other vectors is called the _________________________. Circle the letter of each answer that could describe the magnitude of a vector. a. length b. direction c. amount d. size

Because the two displacements are in opposite directions, the magnitude of the total displacement is ________________________ . Circle the letter that answers the question. What is the displacement of a cyclist who travels 1 mile north, then 1 mile east, and finally 1 mile south? a. 3 miles east b. 1 mile north c. 3 miles south d. 1 mile east