Question

Allen played with the toy which his elder brother made as shown below. He pushed , then held the toy car against the spring, then he let it go. Which one of the following is the correct energy conversation of the toy car from the time it was held against the wall till it stopped moving?
A. Kinetic energy->Kinetic Energy-> Potential energy
B. Heat+Sound energy-> Kinetic energy-> Potential energy
C. Kinetic energy-> Potential energy-> Sound energy+heat energy
D. Potential energy-> Kinetic energy-> Sound energy + heat energy

Answer 1

When Allen is pushing the Toy Car against the Spring, The Energy Allen uses to push the Spring isn't Lost, But it is Stored in the Form of Potential Energy in the Spring.

Now : When Allen let's the Car go, The Spring gets Released and Does the Work on the Car with the help of the Potential Energy Stored. This Potential Energy is transferred to the Car and gets converted into Kinetic Energy.

Now : While the Car is Moving, The Kinetic Energy transforms into Sound Energy and Heat Energy due to the Friction experienced by the Car.

So, The Correct Energy Conversation of the Toy Car from the Time it was held  against the wall till it stopped moving is :

✿ Potential Energy --> Kinetic Energy --> Sound Energy --> Heat Energy

Option D is the Answer