1. Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 28

2. The ballistic pendulum (Cont.)

3. Problem 4 p.200 In a nuclear collision an incoming proton has initial velocity of magnitude m/s. It collides with another proton, initially at rest. After the collision one proton goes off at 37 0 to the x axis. If the collision is perfectly elastic, find the velocities of the two protons after the collision.

4. “Famous Problem” from the book

5. Quiz A block of mass m is sliding on a frictionless table with velocity v 0. It explodes into two pieces, one with mass m/3. The light piece flies off horizontally, perpendicular to the original direction of motion, with velocity 2v 0. Find as many equations as you need to find the velocity of the heavy piece.

6. You are standing on a frictionless surface. Some idiot throws a rock at you which you catch. In terms of your mass, the rock’s mass and the rock’s velocity find your position as a function of time after you catch the rock. Quiz

7. Impulse Changes in a particle’s momentum are due to impulse, which depends on the time over which the net force acts.

8. Have a great day! Hw: Chapter 12 problems and exercises Reading: Chapter 12