Download • Review Session Tonight: – 7-9pm, Hayes

Notes
• Review Session Tonight:
– 7-9pm, Hayes-Healey 127 (where it was last time)
– Exam Covers up to and including Chapter 8
• Practice assignments can be found on WebAssign
• Old Exams on course web site
• Exam October 31:
– 7:45 start in Hesburgh Library Auditorium
Review: Momentum
Suppose rain falls vertically into an open cart rolling along a
straight horizontal track with negligible friction. As a result of the
accumulating water, the speed of the cart
1. increases.
2. does not change.
3. decreases.
The figure shows an approximate representation of the force on a tennis ball
versus time as the tennis ball collides with and rebounds off of a concrete wall.
The tennis ball has a mass of 58 g; it hits the wall with a velocity of 32 m/s
perpendicular to the wall, and rebounds with the same speed, also
perpendicular to the wall. What is the value of Fmax, the maximum contact
force during the collision?
Conservation of Momentum
Two balls are traveling towards each other. A 3kg ball moves to
the right with velocity 4 m/s. A 5kg ball moves to the left, also
with velocity 4 m/s.
a). What is the total momentum of the system?
b). If they stick together, what is their final velocity?
Collsions
Elastic Collisions