Oscillations

Both occur sometime during the oscillation. Physics 132 3/14/12 A mass connected to a spring is oscillating back and forth. Consider two possibilities. Which are true? (i) at some point during the oscillation the mass has v = 0 but a ≠0 (ii) at some point during the oscillation the mass has v = 0 and a = 0 . Both occur sometime during the oscillation. Neither occurs during the oscillation. Only (i) occurs. Only (ii) occurs. NEXUS/Physics Clicker Questions Prof. E. F. Redish

Tracking the motion Physics 132 3/14/12 x NEXUS/Physics Clicker Questions It’s good to have the students work together to try to fill out this chart and then take the results and pose them as clicker questions. The slide will reveal a row of correct answers with each click. Prof. E. F. Redish

If curve (A) is which curve is Physics 122 2/4/11 If curve (A) is which curve is NEXUS/Physics Clicker Questions (A) (B) (C) None of the above. Prof. E. F. Redish

Physics 122 2/4/11 Which of these curves is described by with φ > 0 (and φ << 2π)? NEXUS/Physics Clicker Questions (A) (B) (C) None of the above. Prof. E. F. Redish

When we pull the mass down from its equilibrium and release it, what happens to the energies? The gravitational PE increases decreases remains the same you can’t tell from the information given. NEXUS/Physics Clicker Questions

When we pull the mass down from its equilibrium and release it, what happens to the energies? The spring PE increases decreases remains the same you can’t tell from the information given. NEXUS/Physics Clicker Questions

When we push the mass up from its equilibrium and release it, what happens to the energies? The gravitational PE increases decreases remains the same you can’t tell from the information given. NEXUS/Physics Clicker Questions

When we push the mass up from its equilibrium and release it, what happens to the energies? The springPE increases decreases remains the same you can’t tell from the information given. NEXUS/Physics Clicker Questions

A mass is hanging from a spring A mass is hanging from a spring. The position of the mass is measured by a sonic ranger sitting 25 cm under the mass’s equilibrium position. At some time, the mass is started oscillating. At a later time, the sonic ranger begins to take data. Which graph could represent the velocity of the mass? NEXUS/Physics Clicker Questions

A mass is hanging from a spring A mass is hanging from a spring. The position of the mass is measured by a sonic ranger sitting 25 cm under the mass’s equilibrium position. At some time, the mass is started oscillating. At a later time, the sonic ranger begins to take data. Which graph could represent the net force on the mass? NEXUS/Physics Clicker Questions

A mass is hanging from a spring A mass is hanging from a spring. The position of the mass is measured by a sonic ranger sitting 25 cm under the mass’s equilibrium position. At some time, the mass is started oscillating. At a later time, the sonic ranger begins to take data. Which graph could represent the potential energy of the spring? NEXUS/Physics Clicker Questions

A pendulum is swinging back and forth between the extremes marked A and C. At point B it is directly below the pivot. When it reaches B, the string breaks. What path will the ball follow after the break? NEXUS/Physics Clicker Questions

A pendulum is swinging back and forth between the extremes marked A and C. At point B it is directly below the pivot. When it reaches C, the string breaks. What path will the ball follow after the break? NEXUS/Physics Clicker Questions

A pendulum swings in the plane in front of the marked board A pendulum swings in the plane in front of the marked board. There is a peg (indicated). When the ball passes the peg it will pivot from the peg instead of from the original pivot. How high will it go on the right? peg Not as high as the 30 cm line. Just up to the 30 cm line. Higher than the 30 cm line. You don’t have enough information to tell. NEXUS/Physics Clicker Questions