Newton determined that the force of gravity on an object is proportional to its mass causing its mass to be canceled out (Newton's second law) and resulting in a constant acceleration. If the laws of physics are universal, then Newton should be able to apply his discoveries about gravity on Earth to the motion of the planets in our Solar System. Newton's third law says that for every force there is an equal reaction force in the opposite direction. What does this imply about the force of gravity associated with a person standing on the Earth? Choose one: A. The force of gravity on the person cancels out to zero. B. The Earth's gravity pulls downward on the person but also pushes upward on them. C. The Earth's gravity pulls downward on the person, and the person's gravity pulls upward on the Earth. D. There is twice as much gravitational force on the person than there would be if it weren't for Newton's third law.

4. NASA wants to measure X-Rays but only have equipment that can measure Gamma Rays. Lesson NASA has to develop a new piece of equipment that detects difference wavelengths. Does NASA have to develop a new piece of equipment that detects longer or shorter wavelengths? Explain. __ 5. What is the order of electromagnetic waves from shortest wavelength to longest? __ 6. What is the order of electromagnetic waves from highest frequency to lowest frequency? __ 7. The sun produces all of these rays. Why do you think that not all of these rays are not hitting earth's surface? Explain your answer. __

3. What is the difference between a law about gravity and a theory about gravity?(14 Points) A law says objects fall, while a theory of gravity explains the pull between masses A theory of gravity is less scientific than a law of gravity A theory about gravity is just a guess, while a law is proven forever A law describes what gravity does , while a theory ex- plains why gravity works

1. Describe an example of something with high density and something with low density.

1. Which of the following correctly pairs the particle with its charge A. Electron, Positive B. Neutron, Negative C. Proton, Neutral D. Neutron, Neutral

$\square $ Answer Bank KE: 1000.0 J PE: 3000.0 J KE: 0J $PE:4000.0J$ KE: 2000.0 J PE: 2000.0 J KE: 4000.0 J PE: 0J

When would a swimmer have the most potential energy due to her position? A. Kicking off the side of the pool during a race B. Touching the bottom of the pool C. Traveling across the pool using the backstroke D. Sitting on the highest diving board at the pool

Which statement best describes the meaning of two intersecting lines on a position-time graph? The two objects are at a common position at different times. The two objects are at different positions at the same instant in time. The two objects have the same position at that point in time.

Learning Log: How do you think you get something to have more kinetic energy?

Multiple energy that moves in waves. the form of energy that actually does work. energy that flows between objects with different temperatures. movement of ions or electrons.

1. If two shopping carts of equal mass are pushed with different forces, how will their motion be affected? 2. If two shopping carts with different masses are pushed with the same force, how will their motion be affected? 3. If two shopping carts have different masses, but the same acceleration, what can be said about the forces acting on them? 4. How much force was applied to a 10 kg shopping cart if it accelerated at a rate of $2m/s2$