You are holding a rock tied to a string, which is an example of a pendulum. identify and explain the proper term for each part of the pendulum in this exampledefine mechanical energy. using the example of the skateboarder on the half-pipe, explain how kinetic and potential energy relate to the mechanical energy at different positions.

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

Why does gravity have a lesser than grater effect on higher altitudes?

If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?