If an 80 kg skater starts their run 3.0 m above the ground, it would have the same total energy as the 40 kg skater 6.0 m above the ground. What causes this equivalence? Note: You do not need to use the simulation for this question.

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?