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Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia

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What does the slope of a line on a position vs. time graph mean? velocity

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What does the slope of a line on a velocity vs. time graph mean? acceleration

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What does the area under the line on a velocity vs. time graph mean? displacement

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In the first unit of time the bb falls 1 cm as shown. What is the position of the bb after 3 units of time? 9 cm

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A ball is dropped from rest as shown in the figure. What is the speedometer reading at 3 seconds? 30 m/s

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Joe’s reaction time was 0.12 seconds. He is driving at 20 m/s and sees an obstacle in the road. How far will he move before he can apply the brakes? 2.4 m

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What happens to an unbuckled Kermie when his cart hits a wall? He continues to move forward and hits the wall

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An object is thrown straight upward with a velocity of +50 m/s. At what time will it reach its highest point? t = 5 s

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An object is thrown straight upward with a velocity of +20 m/s. What is its velocity at its highest point? 0

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Carts were released from rest along two different inclines. Which car was on the steeper incline? Cart A Cart B position time Cart A

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Carts were released from rest along two different inclines. Which cart was on the shallower incline? velocity time Cart C Cart D

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Describe the motion of this car Time (s) Position (m) y = 20x + 0 Moving at a constant velocity of 20 m/s

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A ball is dropped from rest as shown in the diagram. What is the speedometer reading at 5 seconds? 50 m/s

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Which color car is moving faster? X(m) Time (s) red

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What is happening at the point where the two lines cross? X(m) Time (s) Same place at same time

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Describe the motion of these two cars X(m) Time (s) Blue – constant speed Red - accelerating

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Do these two cars ever have the same velocity? v(m/s) Time (s) yes

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A plane traveling toward the left wants to drop a package on the X. At what point must the plane drop the package? C

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Describe the a-t graph that matches this motion v(m/s) Time (s) 0 Flat line above 0

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Describe the a-t graph that matches this motion v(m/s) Time (s) 0 Flat line below 0

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An object is thrown straight upward with a velocity of +50 m/s. What is its acceleration at the highest point? -10 m/s 2

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A marble and a bowling ball are dropped from a tower. Ignoring air resistance, which strikes the ground first? Both strike same time

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Describe the motion of this object t = 0 X = 0 X = 1 m X = 4 m X = 9 m acceleration

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What is the displacement of this object for the first 3 s? 15 m

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What is the average velocity for the first 3 s? 5 m/s

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Determine the displacement for the first 3 s. 9 m

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Determine the instantaneous velocity at t = 2 s. 2 m/s

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What is the acceleration of this object? - 2 m/s 2

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A rock is dropped from a bridge and it takes 3 seconds to hit the water. How high is the bridge above the water? Ignore air resistance. 45 m

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Describe the motion of this object t = 0 X = 0 X = 1 m X = 4 m X = 9 m Constant speed

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What is the object’s velocity at t = 7 s? 0 30 60 012345678910101 1212 1313 1414 1515 1616 1717 1818 1919 2020 Time (sec) Velocity (m/s) 30 m/s

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What is the object’s acceleration at t = 18 s? 0 30 60 012345678910101 1212 1313 1414 1515 1616 1717 1818 1919 2020 Time (sec) Velocity (m/s) 12.5 m/s 2

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What is the object’s displacement between t = 5 and t = 9 s? 0 30 60 012345678910101 1212 1313 1414 1515 1616 1717 1818 1919 2020 Time (sec) Velocity (m/s) 120 m

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Where is the object at t = 20 s? 0 30 60 012345678910101 1212 1313 1414 1515 1616 1717 1818 1919 2020 Time (sec) position (m) 10 m

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An object is thrown straight upward with a velocity of +40 m/s. At what time will it reach its highest point? 4 s

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What is the difference between speed and velocity? Speed is how fast; velocity is speed and direction

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Example of an accelerating object that has constant speed Object moving in a circular path

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What is the velocity of an object 7 seconds after being thrown upward with an initial velocity of +50 m/s upward? -20 m/s

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Who was the person who first published a book that suggested the Earth moves around the Sun? Copernicus

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What is the usual reason that an object sliding along a flat surface stops? friction

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An object in motion will continue moving at a constant speed in a straight line UNLESS ________ An unbalanced force acts

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A ball is whirled around in a circle on a string. The string breaks when the ball is at the point shown below. Which letter best describes the path of the ball after the string breaks? b

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MOTION An object is in motion if its position changes. The mathematical description of motion is called kinematics. The simplest kind of motion an object.

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