Study Physics Chp. 2 Review Flash Cards

 
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Physics Chp. 2 Review

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What is the equation for an object moving with constant velocity?
∆x=v(∆t)
What are the 3 equations for an accelerating object?
vf= vi + a(∆t)
vf²=vi²+2a(∆x)
∆x= ½a(∆t)²+vi(∆t)
For an object that is thrown up, how does the velocity up compare to the velocity down at the same level?
equal but opposite in direction
For an object that is thrown up, how does the time up compare to the time down?
equal
For an object that is thrown up, what is the acceleration at the top?
still 9.8 m/s2 downward
For an object that is thrown up, what is the velocity at the top?
0 m/s
When do we have free fall on Earth?
dense object and short distances
What does a positive sign mean?
to the right or up
What does a negative sign mean?
to the left or down
What is the acceleration due to gravity?
9.8 m/s2 downward
What is free fall?
falling without air resistance (objects must be dropped or thrown)
What does the steepness of the slope represent on an x vs. t graph?
the speed of the object
What does a line with a negative slope mean on an x vs. t graph?
the object is moving towards the origin (detector)
What does a line with a positive slope mean on an x vs. t graph?
the object is moving away from the origin (detector)
What does a horizontal line on an x vs. t graph represent?
the object is standing still
What direction does the acceleration arrow point in a motion diagram?
towards the longer velocity arrow
What are the usual units of acceleration?
meters per second squared (m/s2)
What are the usual units for velocity?
meters per second (m/s)
What are the usual units for time?
seconds (s)
What are the usual units for displacement?
meters (m)
What is speed?
how fast something moves
What is distance?2
how far something moves
What is velocity?
how fast something moves and in what direction
What is displacement?
how far something moves and the direction it moved
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