WELCOME BACK! Its Day 6 of physics!

Take a look at the HW quiz QUIZ BACK Take a look at the HW quiz

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IN 2 CLASSES There will be a 6 question quiz on CLASS INFO since day 1 No HW, just you and calculator

GRAPH BOOT CAMP Basic Training: The facts Position-Time Graph Position Velocity Read the Y axis Take the slope for the time period needed Velocity-Time Graph Velocity Acceleration Displacement Read the Y axis (above x axis is +) Take the slope for the time period needed Find the area between the line and the x axis (you cannot find the actual position, just the amount changed)

To The Board! You will draw three graphs with me to show you are understanding this. Scenario: Toss pen up in air, it comes back down to your hand. Draw the position-time graph. Circle where the max height occurs Next to it write an explanation on why it is shaped the way you drew it.

MY GRAPH

WHY? Went back into your hand….Overall displacement is ZERO. So the graph starts and ends at the same place. End up HIGH at the max height. That’s the tallest part of the graph. Never NEGATIVE because it does not go below your starting point (hand). Its CURVED because of acceleration.

To The Board! Scenario: Toss pen up in air, it comes back down to your hand. Draw the velocity-graph. Circle where the max height occurs Next to it write an explanation on why it is shaped the way you drew it.

MY GRAPH

WHY? Starts off + because going up. Taking the slopes of parts of the graph told us that. / Gets less + because the slopes become flatter At the top its 0 because the slope at that point is FLAT. Becomes more and more – because the slopes are more \ .

To The Board! Scenario: Toss pen up in air, it comes back down to your hand. Draw the acceleration-time graph. Next to it write an explanation on why it is shaped the way you drew it.

MY GRAPH

WHY? Because the slope of velocity is a straight line. So it’s a non-changing value. And its – because its sloped like \ Its gravity!

MAJOR CONCLUSIONS! Because the slope of velocity is a straight line. So it’s a non-changing value. And its – because its sloped like \ Its gravity!....Back to your seats

My Turn At 4 seconds how far are you from the start? What is your average velocity during that time? How far did you go from 4 to 8 seconds? What would your average velocity be during that time?

Notice its curved…what does that tell us? 1) There is an acceleration. 2) Since the curve is upwards, it’s a + acceleration. 3) The velocity graph starts at low + and increases

Which graph best represents the motion of an object whose speed is increasing?

Which graph best represents the motion of an object initially at rest and accelerating 

TRUE OR FALSE, AND WHY? 1) A car that is slowing down has a negative acceleration A ball thrown down from the top of THS will gain more speed per second than a ball dropped from the top of THS.

TRUE OR FALSE, AND WHY? 1) If an object is accelerating, then the velocity of the object can never be zero at any time. If an object has a velocity of zero for a moment, its acceleration at that moment is zero.

TRUE OR FALSE, AND WHY? 1) If an object keeps the same ‘speed’ or magnitude but changes direction, there is an acceleration. If an objects acceleration is constant, then it must stay in the same direction.

TRUE OR FALSE, AND WHY? 1) If an object is thrown up hard enough, it will no longer come back down. If you throw an object hard enough, gravity will not slow it down at all.