A student hits a hockey puck with a hockey stick and the puck speeds up. Another student claims that the student broke the Law of Conservation of Momentum
because the puck gained momentum. Which of the following is the best
explanation of why the Law is not broken in this closed system?
The Law of Conservation of Momentum only applies for objects of equal mass.
The momentum of the puck is the same before and after the hockey stick hits
the puck.
The hockey stick loses as much momentum as the puck gained.
The force on the puck cancels the force on the hockey stick because the forces
are equal and opposite.

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.