Rotational motion question 2. A small piece of clay is stuck near the edge of a

Question

Rotational motion question

2. A small piece of clay is stuck near the edge of a phonograph turntable. Let a represent the angular acceleration of the clay and a, represent the centripetal acceleration of the clay a. For each situation described below, describe a possible motion of the turntable. (Some parts have more than one correct answer.) Explain your reasoning in each case. i, lal 0 and la,l 0 ii. lal 0 and larl 0 iii. al 0 and la,l z 0 b. The equation "a a, /r is not a correct vector equation i. Explain how you can tell that the vector equation above is not correct. i. Is "a a, /r" a correct scalar equation? Explain why or why not

Explanation / Answer

a.)

i) The turntable is not turning. There is no motion. Otherwise, with no centripetal acceleration, the clay would not stay on the turntable.

ii.) The turntable is turning at a constant, non-zero angular velocity. The rate at which the turntable turns does not change.

iii.) The turntable is turning at an increasing or decreasing, non-zero angular velocity.

b.)

i)

is pointing either above or below the turn table

r points inwards

ii)

= tan/r

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.