Answer Happy

The purpose of this experiment is to explore the Law of Conservation of Linear Momentum and changes of Kinetic Energy in both elastic and inelastic collisions. Theory: The momentum p of an object is the product of its mass and its velocity p = mū Momentum is a vector quantity since it comes from velocity (a vector) multiplied by mass (a scalar). The law of conservation of linear momentum states that the total momentum of all bodies within an isolated system is conserved, that is, if the total linear momentum of an isolated system has some initial value pi, then, whatever happens later, the final value of the total linear momentum must be equal to the initial value. We can write the law of conservation of linear momentum as Ďf pi In this experiment we will be looking at a head-on collision between two boxes moving along straight line (x-axis), so that conservation of the linear momentum can be stated mathematically as: m1v1 + m2v2 = mv'1 + mzv'z 2 where vį and v2 are velocities of the boxes before collision whereas v'1 and v'z are their velocities after collision. Positive sign of the velocities corresponds to the motion in the positive x direction, negative velocities describe motion in the negative x-direction. In elastic collisions, the total kinetic energy KE of the system is also conserved. mi miví 2 + m2 v2 2 12 V 22 m2ul2 + 2 2 == In inelastic collisions, the total kinetic energy of the system is not conserved. Part of the kinetic energy is transformed into the heat as Q = KE; – KEF
Procedure: Run Alpes . Club Det Pause Reset www Vre10 Veischleho Poste Tracy) Record Www how Part A. Perfectly elastic collision (set elasticity to 1) 1. Set m1 = 4kg v1 = 5" (red box) and m2 = 3kg v2 = -2" (blue box) and run the collision. 2. Note linear momentum p before and after collision for each box and kinetic energy KE before and after collision for each box. Record your data in the table below. 3. Calculate the total linear momentum of the two-box system before and after collision and the total kinetic energy of the system before and after collision. Record your results in the data table below. mi m2 Total Momentum before Item Red Blue (kgm/s) Total Momentum after Mass (kg) (kgm/s) Momentum before (kgm/s) Total KE before (J) Momentum after (kgm/s) Total KE after (J) Kinetic energy before (1) Kinetic energy after (J) Part B. Totally inelastic collision (set elasticity to 0) Repeat experiment from Part A.
mi m2 Total Momentum before Item Red Blue (kgm/s) Total Momentum after Mass (kg) (kgm/s) Momentum before (kgm/s) Total KE before (5) Momentum after (kg m/s) Total KE after () Kinetic energy before (J) Kinetic energy after (1) Questions: 1. How does the total momentum before the collision compare to the total momentum after the collision in a) elastic collision, b) inelastic collision? 2. How does the total KE before the collision compare to the total KE after the collision in a) elastic collision, b) inelastic collision? 3. What amount of heat was released in a) elastic collision, b) inelastic collision? Show your work.