PHSX 211 10th Edition Lecture 17 Outline of Last Lecture I. Impulse: The amount of force exerted over a period of timea. Impulse (J) = F*tb. J = ΔpII. Momentum: The force described by an object’s mass and velocitya. Momentum (p) = m*vIII. What is the impulse final velocity of an object of 2 kg with a force of -2 N over a time period of .5 seconds with an initial velocity of 1 m/s?IV. What is the initial momentum and final momentum and impulse of an object of 2 kg starting with a velocity of -1 m/s and a final velocity of 2 m/s?V. A bouncy ball of 0.1 kg is traveling at 10 m/s right before it hits a ground and bounces back at 8 m/s. It has an impulse period of .05 seconds. What is the force the ball exerts on the ground?Outline of Current Lecture Practice ProblemsI. If you are at a carnival and want to knock down a piece of wood which ball (of equal mass and velocity) would you choose between a rubber bouncy ball and a sticky clay ball?II. A 40 kg girl is on an 8.4 kg sled going at 20 m/s. The girl jumps off the sled and right afterjumping has a speed of 25 m/s in the original direction of motion. What is the velocity ofthe sled?III. If you have Car 1 of 1000 kg moving East at 14 m/s and Car 2 of 1500 kg moving North at11 m/s and they collide and get their bumpers locked, what will their final velocity be?Current LecturePractice ProblemsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.IV. If you are at a carnival and want to knock down a piece of wood which ball (of equal mass and velocity) would you choose between a rubber bouncy ball and a sticky clay ball?a. We would want to choose the ball which would have the larger impulse, because it would transfer the same amount of force for a longer duration of time.b. Using the equation Δp = J we know that the impulse created by the rubber bouncy ball would be greater because its change in momentum is greater.c. Its momentum is greater because they have the same initial momentum, but their final momentum is different and since the rubber bouncy ball bounces backfrom the board its momentum will have greater magnitude than the clay ball which will have a smaller to zero final momentum. d. Because the rubber bouncy ball has a greater impulse it would create a larger force thus having a better chance of knocking over the piece of wood. V. A 40 kg girl is on an 8.4 kg sled going at 20 m/s. The girl jumps off the sled and right afterjumping has a speed of 25 m/s in the original direction of motion. What is the final velocity of the sled?a. -3.81 m/s or 3.81 m/s in the opposite direction of the girlpi= pf(mgirl+msled)vi=mgirlvfgirl+msledvf sled(40+8.4)(20)=(40)(25)+(8.4)vfsled−3.81=vfsledVI. If you have Car 1 of 1000 kg moving East at 14 m/s and Car 2 of 1500 kg moving North at11 m/s and they collide and get their bumpers locked, what will their final velocity be?a. Find the resultant vectorb. Final velocity = 5.6i + 6.6j (in component form)c. P = 14000i + 16500j = 2500vfd. Vf = 5.6i + 6.6j(11) * (1500) = 16500(14) * (1000)