Potential energy (PE) is the energy that is stored in an object due to its position charge, stress etc. Here are a few potential energy examples with solutions. These potential energy practice problems will help you learn how to calculate PE, mass, height.
Let us consider a potential energy practice problem : An object of mass 30 kgs is placed on a hill top of height 80m. What is the potential energy possessed by the object?
We can calculate the potential energy of the object using the given formula
Substituting the values in the formula,
PE = m x g x h = 30 x 9.8 x 80 = 23520 J
Note: We know that the acceleration due to gravity is constant and is always equal to 9.8 m/s2
Therefore, the potential energy of the object is 23520 J.
Refer the below potential energy sample problem and calculate mass based on the potential energy, height and gravity. A fruit hangs from a tree and is about to fall to the ground of 10 meters height. It has a potential energy of 22.5 J. Calculate the mass of the fruit
Substitute the values using the given formula, M = PE / (g x h) = 22.5 / (9.8 x 10) = 0.229 kg
Therefore, the value of Mass is 0.229 kg
Refer the below example of potential energy and learn how to calculate height from PE and mass.
Let us consider a potential energy worked example problem: 5 kg weighing cat climbing at the top of the tree has a potential energy of 1176 kg. Find the height of the tree?
Substitute the values using the given formula, H = PE / (m x g) = 1176 / (9.8 x 5) = 24 cm
Therefore, the height of the tree is 24 cm