On a frictionless air track, a 0.160 kg glider moving at 1.10 m/s to the right collides with and sticks to a stationary 0.245 kg glider. (a) What is the net momentum of this two glider system before the collison?
(b) What must be the net momentum of this system after the collision? Why?
(c) Use your answers in parts (a) and (b) to find the speed of the gliders after the collision.
(d) Is kinectic energy conserved during the collision?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?