Level 1: Scalar vs. Vector



Practice: Describing MotionLevel 1: Scalar vs. VectorVector or Scalar?Decide whether the following are vectors or scalars. Talk to your other group members to make sure they agree.a. 5 mb. 30 m/sec, Eastc. 5 mi., Downd. 20 degrees Celsiuse. +256 km/hrf. 4000 Caloriesg. -3.6 x 103 cmh. 75° Fahrenheit i. 65 m2Level 2: Distance vs. DisplacementMake sure that, as you answer the questions below, you talk with your group to see if you agree on the answers. You may be asked similar questions in your challenges.True or False: An object can be moving for 10 seconds and still have zero displacement. a. True b. FalseIf the above statement is true, then describe an example of such a motion. If the above statement is false, then explain why it is false.Suppose that you run along three different paths from location A to location B. Along which path(s) would your distance traveled be different than your displacement? ____________You run from your house to a friend's house that is 3 miles away. You then walk home.a. What distance did you travel? ______________b. What was the displacement for the entire trip? _______________Observe the diagram below. A person starts at A, walks along the bold path and finishes at B. Each square is 1 km along its edge. Use the diagram in answering the next two questions.8. This person walks a distance of ________ km.4562475450859. This person has a displacement of ________.a. 0 km b. 3 km c. 3 km, E d. 3 km, We. 5 km f. 5 km, N g. 5 km, S h. 6 kmi. 6 km, E j. 6 km, W k. 31 km l. 31 km, Em. 31 km, W n. None of these.Level 3: Speed vs. VelocityA dolphin’s tops speed is 17 m/s. If a dolphin swam at this constant velocity for one hour (3600 s), how far would she go?VariablesEquationDo the Math!A shark’s top speed is 19.5 m/s. In the previous problem, a dolphin swam 61200 m. How long would it take a shark to swim this far?VariablesEquationDo the Math!V=d=t=V= d/tYou are on a road trip with your best friend. You drive 1300 m north and then 500 m south.What was your displacement? Include your direction.What was the distance of your journey?What was your total velocity?What was your total speed? You run from your house to a friend's house that is 3 miles away in 30 minutes. You thenimmediately walk home, taking 1 hour on your return trip. a. What was the average speed (in mi/hr) for the entire trip? _______________b. What was the average velocity (in mi/hr) for the entire trip? _______________In 1960, U.S. Air Force Captain Joseph Kittinger broke the records for the both the fastest and the longest sky dive…he fell an amazing 19.5 miles! (Cool facts: There is almost no air at that altitude, and he said that he almost didn’t feel like he was falling because there was no whistling from the wind or movement of his clothing through the air). His average speed while falling was 254 miles/hour. How much time did the dive last? Suppose that you run for 10 seconds along three different paths.Rank the three paths from the lowest average speed to the greatest average speed. Rank the three paths from the lowest average velocity to the greatest average velocityJedi Practice ProblemThis is not a required problem. Jedi problems are more difficult problems designed to help you push your thinking. They require a good understanding of physics and more advanced reasoning skills. If you find the precious problems too easy, you may want to try the Jedi problems. They will probably be more interesting to you. Students who make a habit of solving Jedi problems successfully can request a placement in AP Physics next year. Position-time information for a giant sea turtle, a cheetah, and the continent of North America are shown in the data tables below. Assume that the motion is uniform for these three objects and fill in the blanks of the table. Then record the speed of these three objects (include units).Level 4: AccelerationAn object is accelerating if it is moving _____. Circle all that apply.a. with changing speed b. extremely fast c. with constant velocityd. in a circle e. downward f. none of theseAccelerating objects are objects that are changing their velocity. Name the three controls on an automobile that cause it to accelerate.If an object is NOT accelerating, then one knows for sure that it is ______.a. at rest b. moving with a constant speedc. slowing down d. maintaining a constant velocityAn object with an acceleration of 10 m/s2 will ____. Circle all that apply.a. move 10 meters in 1 second b. change its velocity by 10 m/s in 1 sc. move 100 meters in 10 seconds d. have a velocity of 100 m/s after 10 sA car slows down from +32 m/s to +8 m/s in 4 s. Calculate the acceleration.VariablesChoose an equationDo the Math!Vi=Vf=a=t=A tiny pig in boots is running across the yard to eat its dinner out of a tiny tea cup. It starts from rest and runs until it reaches a velocity of 3.6 m/s. This whole thing takes 2.3 s. What is the pig’s acceleration?VariablesChoose an equationDo the Math!Vi=Vf=a=t=483870017272000A car speeds up from rest to +16 m/s in 4 s. Calculate the acceleration.Ms. Story's (imaginary) Porsche accelerates from 0 to 60 mi/hr in 4 seconds. Its acceleration is _____ .a. 60 mi/hr b. 15 m/s/s c. 15 mi/hr/s d. -15 mi/hr/s e. none of theseTo test your understanding of the concept of acceleration, consider the following problems and the corresponding solutions. Use the equation for acceleration to determine the acceleration for the following two motions.6953251905 ................
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