You are presented with the quiz "Hitting an object can cause that object to what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "hitting an object causes the particles in that object to vibrate" and "when the particles in the coal or the particles in the lamp filament get hot they start to vibrate". 

So, what's the best answer to the question?


 

   get hot        