1. Were the collisions elastic or inelastic? EXPLAIN. Inelastic, Because the kinetic energy will be changed to some other form of energy in the collision. 2. Was momentum conserved during the collisions? EXPLAIN. 3. Was mechanical energy (E= K+U) conserved during the collisions? EXPLAIN. 4. Was the momentum of the pendulum and the ball conserved after collision? EXPLAIN.

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?