A 4 kg rock is dropped from 5 m. There is no friction. What kind of energy does is have before? What kind of energy does it have after? Was work done? Put the above into the law of conservation of energy.
Physics · High School · Tue Nov 03 2020
Answered on
Given:
A 4 kg rock is dropped from 5 m. There is no friction.
Determine the energy that the rock has, before, during, and after.
Explanation:
Before the rock was dropped from 5 m, it contains potential energy since it is in a stationary position given the mass and height location of the object. After the rock was dropped it contains gravitation energy since we take into account the acceleration due to gravity measured by 9.81 m/s^2 that is affecting all falling bodies. Lastly, after the rock hit the ground, it contains collision energy, which occurs whenever a body has collided with another body or object. Hence the law of conservation of energy is applicable since, despite all the processes that the rock has undergone, energy is still conserved in the rock even after it hits the ground.