Try This
Using conservation of momentum, explain why a gun recoils when you shoot it.  Question: If a 30-g bullet is shot with a velocity of +300 m/s from a 7.5-kg gun, what is the recoil velocity of the gun?  Verify your answers, where possible, by using the Collision 1D Simulator.

 

An object, initially travelling to the right, collides with another object that is at rest. After the collision, the objects stick together and move to the left. Is this collision possible? Explain why or why not.

This is not possible. The initial momentum of the system is to the right; therefore, the final momentum must also be to the right.


Newton's second and third laws can be used to derive the equation for impulse. In fact, Newton's original writings defined force in terms of momentum and time, not the that we used in Physics 20. However, you most likely haven't learned the calculus required to understand Newton's original definition of force.

To learn how the impulse is derived from Newton's second and third law, watch the following video


Read momentum is Conserved in One-dimensional Collisions
Read "Momentum is Conserved in One-dimensional Collisions" on pages 473 to 475 of your physics textbook.


Try This
Answer questions 1, 2, 5, 6, and 7 of "9.3 Check and Reflect" on page 486 of your physics textbook.