Automatic Givens
What is the vi for a free fall or horizontal launched vertical component?
0 m/s
What is the speed of a ball after it has fallen freely from rest for 12 meters?
15 m/s
Describe the graph of displacement vs. time for a projectile motion question.
Decreasing concave down in quadrant IV.
When an object is dropped down
What is free fall?
Does mass matter in the rate of falling objects?
No.
In free fall on Earth, what is the acceleration?
-9.81 m/s²
An arrow is shot at 89 m/s into the sky, aimed 80 degrees to the horizontal. How long does it take it to reach its max. height?
8.77 s
Describe the graph of velocity vs. time for the vertical component of a projectile motion problem.
Indirect, linear, quadrant IV
The distance travelled in the y-axis.
What is height?
What is the law of acceleration due to gravity?
All objects fall at the same rate, regardless of mass, provided there is no friction.
Automatic given regarding time in a toss up or projectile motion at an angle problems.
Time going up equals the time going down.
A ball is shot from a cannon at 68 degrees from the horizontal with an initial velocity of 54 m/s. What is the vix?
20.23 m/s
Describe the graph of velocity vs. time for a toss-up problem.
Indirect, linear, both quadrants I and IV
The definition of a projectile
What is an object launched with both vertical and horizontal values.
Is there air resistance on the moon?
No.
What is the acceleration due to gravity in space?
0 m/s2
A ball is thrown horizontally from a cliff at 24 m/s. If the ball hits the ground 4 s later, how tall is the cliff?
78 m
Describe the graph of acceleration vs. time on earth for a toss up problem.
Constant at -9.81 m/s²
The distance travelled in the x-axis.
What is range?
What is the difference between a toss-up and projectile motion scenario?
A toss-up scenario has no x-axis values because an object is thrown straight up at a 90 degree angle.
In a projectile motion question, what happens to the x-axis velocity?
It remains the same (vi=vf).
A ball is shot from a cannon at 68 degrees from the horizontal with an initial velocity of 54 m/s. What is the viy?
50.07 m/s
Describe the graph of displacement vs. time for the horizontal component of a projectile motion problem.
Direct, positive, linear.
The path a projectile follows.
Trajectory.
What factors affect "g"?
Air resistance (friction).