Which of the following best describes why an egg landing on a pillow is less likely to break than a pillow landing on a tile floor? Your answer: The pillow increases the time over which the egg stops, and that decreases the maximum force on the egg. The pillow decreases the time over which the egg stops, and that decreases the maximum force on the egg. The pillow increases the impulse during the collision, and that makes the egg safer. The pillow decreases the impulse during the collision, and that makes the egg safer.

When there is motion is both directions, state which direction is positive at the START of the problem.  For the impulse-momentum and the conservation of momentum problems: Plug your GIVEN VALUES into the equation FIRST then do the algebra. Use the following equations: F t = m vf -m vi  m1 vi1 + m2 vi2 = m1 vf1 + m2 vf2 m1 vi1 + m2 vi2 = (m1 + m2) vf (m1 + m2) Vi = m1 vf1 + m2 vf2 6.) Ball 1 : m1 = 8 slugs and vi1 = 3 ft/s to the RIGHT  Ball 2: m2 = 4 slugs and vi2 = 0 Ball 3: m3 = 6 slugs and vi3 = 0 picture the three balls all siting on a flat surface with some space between them.  AFTER ball 1 strikes ball 2, ball 1 is traveling at 1.5 ft/s to the LEFT AFTER ball 2 strikes ball 3, ball 2 is traveling at 3 ft/s to the LEFT a,) What is the direction (left or right) and final velocity of ball 3? Vf3 =? Show all unit conversions step by step, if any.

An oatmeal cookie is dropped on the floor. Is this an inelastic collision? Why or why not? It is because the cookie and floor can be considered one object. It is because the cookie and floor are stuck together. It is not because there is not momentum involved. It is not because the cookie and floor do not move away together as a unit.

Can any real collision ever be truly perfectly elastic? Why or why not? (You should think about this in two ways: first consider what effects of the environment surrounding the collision might have on energy and momentum conservation; second, consider the objects themselves – how must an object react to a collision in order to be considered "perfect"?).

When there is motion is both directions, state which direction is positive at the START of the problem.  For the impulse-momentum and the conservation of momentum problems: Plug your GIVEN VALUES into the equation FIRST then do the algebra. Use the following equations: F t = m vf -m vi  m1 vi1 + m2 vi2 = m1 vf1 + m2 vf2 m1 vi1 + m2 vi2 = (m1 + m2) vf (m1 + m2) Vi = m1 vf1 + m2 vf2 2. ) The baseball is traveling at 90 mph to the left towards the batter. The batter strikes the 0.05 slug baseball with a force of 50.00 lbs. The bat is in contact with the softball for 0.25 seconds. Assume that the baseball is traveling directly in the opposite direction after being hit with the bat. a. what is the velocity of the baseball after being hit by the batter? show all unit conversions-if any, step by step.

A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass: O the change in momentum is greater. the change in momentum is less. the time interval for stopping is greater. the time interval for stopping is less.

During a head on collision the car's airbags are intended to: O Decrease the speed of the vehicle prior to the accident. Decrease the impulse of the accident on the passengers, by decreasing the force the impact. Match the impact force of the passenger to what the vehicle is colliding with. O Decrease the force of impact on the passengers by keeping the impulse constant.

A 1500 kg car traveling to the north is slowed down uniformly from initial velocity of 20 m/s by a 6000 N braking force acting opposite the car’s motion.  Use the impulse-momentum theorem to answer the following questions  What is the car’s velocity after 2.00 s? How far does the car move during 2.00 s? How long does it take the car to come to a complete stop?

Let's assume a perfectly elastic collision between a golf club (mass of 250 gr) and a golf ball (mass of 46 gr). If the club hits the ball at a speed of 45 m/sec what will be the speed of the ball after the impact?  What happens if the mass of the club is doubled?

I. A lump of clay (m = 3.00 kg) is thrown towards a wall at speed v = 3.00 m/s. The lump sticks to the wall. (a) What kind of collision is it? Is momentum conserved during this collision? Why or why not? (b) Calculate the impulse imparted on the lump by the wall. (c) Calculate percent of initial kinetic energy lost during this collision. II. Same lump is thrown towards the same wall, but this time it bounces off the wall at speed of 3.00 m/s. (a) What kind of collision is it? Is momentum conserved during this collision? Why or why not? (b) Calculate the impulse imparted on the lump by the wall. (c) Calculate percent of initial kinetic energy lost during this collision. III. Same lump is thrown towards the same wall, but this time it bounces off the wall at speed of 2.00 m/s. (a) What kind of collision is it? Is momentum conserved during this collision? Why or why not? (b) Calculate the impulse imparted on the lump by the wall. (c) Calculate percent of initial kinetic energy lost during…