during an explosion, the total kinetic energy is always conserved 2. An impulse always goes in the same direction as the applied force. 3. during an explosion of an object the sum of the momentum of all fragments is equal to the momentum of the object before the explosion 4. The momentum of a system is always conserved even if an external force acts on the system. 5. Momentum is a vector quantity during a perfectly inelastic collision between two masses the two masses

In a collision between two objects of unequal mass, which object receives a greater magnitude impulse? Select one: a. the object of smaller mass b. the object of larger mass c. They receive equal magnitude impulses.

3. The of momentumexplains how it is possible for a rocket to speed up in empty space even if no external force is exerted on it. 4. A/an Collisian them to change velocity. is an interaction between objects that causes one or more of 5. Momentum is conserved in all collisions, but kinetic energy is only conserved in a/an elostic collision 6. A collision where the objects stick together after impact is called a/an Inelostic collision Review Questionswrite in complete sentences. 7. Jorge is conducting an investigation into perfectly inelastic collisions using equipment where two carts collide with each other. He scan set up the carts either to bounce off each other or to stick together upon impact. Which setting should he use?

A 2 kg particle is acted on by a force as shown in the image below. The particle has an initial velocity vector (before the force is applied) of ₁ = 4 + 3) m/s and a final velocity vector (after the force is applied) of ₂ = -21+ 6) m/s. The force is applied for 3 s. a. Determine the impulse that has acted on the particle b. Determine the average force applied and its angle c. The net work done by the force acting on the particle (No change in particle height) Note: The image shown below is a top-down view of the particle and force. F X

15. Each of the following scenarios involves a system containing 2 objects. In which of the scenarios is the total momentum of the 2 object system constant? (Assume that both the ice rink and the surface of the air track are frictionless) i. A ball bounces elastically off the wall of a building. ii. Two kids shove each other on very slippery ice skating rink A basketball player is standing with her feet stationary on the ground and catches a ball. iii. iv. Two gliders on a horizontal air track collide and stick together during the collision V. Two gliders on a horizontal air track collide and bounce off each other elastically A) i, ii and iv B) ii, iv, v C) i, iii D) i, iii, iv, v E) iv, v

1. A projectile of mass m = target of mass M = projectile-target combination has a speed V of 0.2kg and initial speed v; = 200 ms-1 hits a stationary 2kg and gets imbedded in it. Immediately after the collision the (a) V = 18.2 ms-1 (b) V = 20.0 ms-1 (c) V = 60.3 ms-1 (d) V = 63.2 ms-1

3. A ball of mass 25 g traveling east at 12 m/s bounces elastically into a 2nd ball of mass 50 that is traveling west at 4m/s. What are the final velocities and momentum of each ball? (Hint: either solve the systems of equations for momentum and energy simultaneously or come up with a relative velocity system..) Place ball 2 in a moving reference frame so that it's velocity is 0 in this reference frame. In this reference frame ball 1 has 16 m/s initial velocity. Find the final velocities in this moving reference frame. m2 V10 m1 + m2 2m1 m1 v'1F v'2F V10 m1 + m2 Don't forget to come back out of the moving reference frame at the end... (since we added velocities before this time we subtract...

3. This problem refers to the figure below: mmm There are 3 identical bobs of mass m hanging side-by-side. Two are then lifted to a height of h and released. The collisions in this problem are elastic. Answer the following questions: (a) Let's call the initial and final state immediately before and after the collision, respectively. Write down the initial momentum and kinetic energy of the system in terms of m and h. (b) Show that, after the collision, the left and center bobs rise to height h while the right bob becomes stationary. In particular, show that the center bob acts as if it were swinging freely as a lone pendulum.

An astronaut floating at rest in space throws a wrench in one direction and subsequently recoils back with a velocity in the opposite direction. Which of the following statements is/are true? 1. The velocity of the wrench is equal and opposite to the velocity of the astronaut. II. The momentum of the wrench is equal and opposite to the momentum of the astronaut. III. The impulse applied to the wrench is equal and opposite to the impulse applied to the astronaut. II and III only I only Il only I, II, and III I and II only

Two particles with different initial momentum collide and stick to each other. Compared to before the collision, the system of two objects after the collision has? Explain.  A. Less total momentum and less kinetic energy B. Less total momentum but the same amount of total kinetic energy. C. Not enough information is given to decide. D. The same amount of total momentum and the same total kinetic energy. E. The same amount of total momentum, but less total kinetic energy.