# A baseball was thrown from a cliff and the projectile

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2. [2 Points] A baseball was thrown from a cliff and the projectile motion was simulated by using a computer. The relationship between the vertical position (in the y-direction) and the horizontal position (in the x-direction) is shown graphically below. One of the curves was generated for the case when there was no air resistance, and the other curve was generated when air resistance was present. The initial velocities and angles of the baseball are the same. Answer the following questions regarding the curves and the motion. (a)Which curve represents the motion when air resistance was present? Circle your choice. Curve I Curve II
(b)The curves were drawn and extended below the line y= 0. What does this mean physically? Circle your choice.
6 3. [5 Points] The block is initially given a push, then it slides down a frictionless track (under the influence of gravity) and remains in contact with the track all the way around the loop. Five locations along the track (A, B, C, D, E) are indicated on the diagram. In the table below, circle the location(s) (A, B, C etc.) that have the following attributes. If there are no such locations, circle “none”. Tangential acceleration (at) = 0 at … A B C D E Normal acceleration (an) = 0 at … A B C D E Normal component of velocity (vn) is nonzeroat … A B C D E Speed is decreasing at … A B C D E Acceleration and velocity vectors are perpendicular at … A B C D E none none none none none
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