Which of the following is an example of a physical change?
a. water freezing
b. a cake baking
c. a match burning
d. fireworks exploding

Awalk up the phase change graph worksheet

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?