Question

A 1-kg hockey puck at rest with Velcro wrapped around its side lays on top of an ice pond (consider this surface to be frictionless). A skater hits the puck and it moves with a constant speed of 8 m/s. The puck is headed towards another identical puck found at rest on the same pond. They collide, get stuck together, and move together as a single object from that point on. Answer the following questions. All calculation answers require correct metric system units. In order to receive credit for your answers, all calculation questions REQUIRE THAT

Answer 1

1– When combined together, what is the weight (NOT MASS) of the moving pucks?

2 – What is the net force acting on the moving puck prior to the collision of pucks?

3– What is the speed of the pucks when they move together after colliding?

4 – What is the momentum of the pucks when moving together?

5 – What is the kinetic energy of the combined pucks after they collide?

Answer 2

Momentum and energy are conserved. So the total amount of these is the same both before and after the collision.

Momentum is mass * velocity and (kinetic) energy is 1/2 * mass * velocity^2

Have a go!