The diagram below represents a strobe photograph of the ...
The diagram below represents a strobe photograph of the motion of a ball as it rolls up a track.
[pic]
1. Draw vectors on your diagram that represent the instantaneous velocity of the ball at each of the labeled locations. The “tail” of the vector should be located on the ball itself.
2. Compare the velocities at points 1 and 2 by drawing the vectors that represent those velocities with their “tails” at the same point.
3. Draw the vector that must be added to the velocity at the earlier time to equal the velocity at the later time. Label it Δv.
The diagram below represents a strobe photograph of the motion of a ball as it rolls down the track.
[pic]
1. Choose two sequential times on your diagram and draw the velocity vectors of the ball corresponding to those times side-by-side. Determine the vector that must be added to the velocity at the earlier time to equal the velocity at the later time. Is the name “change in velocity” appropriate for this vector?
2. Draw a vector to represent the acceleration of the ball between the points you chose above.
How is the direction of the change in velocity vector related to the direction of the acceleration vector? Explain.
The Turnaround
Complete the velocity diagram below for the portion of the motion that includes the turnaround.
[pic]
1. Choose a point before the turnaround and another, after. Draw the vector that must be added to the velocity at the earlier time to obtain the velocity at the later time.
2. Suppose that you had chosen the turnaround as one of your points.
Would this choice affect the direction of the change in velocity vector?
What is the velocity at the turnaround point? Explain.
What is the acceleration at the turnaround point? Explain.
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