Physics Midterm 2
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- What were the five measurements made by the Greeks?
- Size of the Earth, Size of the Moon, Distance to the Moon, Distance to the Sun, Size of the Sun
- What is the scientific method?
- Recognize the question, make hypothesis, predict the consequences, perform experiments, formulate rule from data
- What is a law?
- A thoroughly tested hypothesis
- What is a scientific theory?
- A well-tested hypothesis encompassing vast amounts of research and knowledge. A theory can evolve and change with added data
- What must a scientific hypothesis be capable of?
- It must be able to be proven both right and wrong, or else it is not scientific
- What is a pseudoscience? Give an example
- It is a false science with a base in some facts, but it makes unreasonable and unscientific assumptions. An example is horoscopes and reading the stars
- Why is physics called "the basic science"?
- Because it deals with the most basic parts of science. Its topics serve as the base for all other science
- What is Newton's first law of motion?
- An object at rest stays at rest, and an object in constant motion stays in constant motion unless acted upon by a net force
- What is inertia?
- The property of an object to resist changes in motion
- What is a force?
- A push or a pull
- What is support force?
- An upward force that supports an object at an equal rate to the force of gravity
- If an object is in equilibrium, does that mean it is at rest?
- Not necessarily, it just means that it has no net force, meaning that it is either at rest or moving at a constant rate.
- How many sig figs does 0.02 have?
- One
- How many sig figs does 5.00 have?
- 3
- What does N represent for units?
- kgm/s2
- How do you find average speed?
- Total distance/time traveled
- What is the difference between speed and velocity?
- Velocity has direction
- What is the formula for acceleration?
- Change in velocity/time
- Does acceleration include direction?
- Yes, because it uses velocity
- What is free fall?
- When an object is falling with only the force of gravity as a force. No air friction
- What is the equation for the velocity of an object in free fall?
- velocity= 9.8 m/s2 * time
- What does g equal?
- 9.8 m/s2 or acceleration due to gravity
- How do you calculate distance in free fall?
- distance= 1/2 (gt2)
- Does d=1/2(gt2) find all distances?
- No, it only works in free fall
- What is net force directly proportional to?
- acceleration
- What is mass?
- The amount of matter in an object
- What is weight?
- The force upon an object due to gravity
- How does mass relate to acceleration?
- Acceleration is inversely proportional to mass
- What is another formula for determining acceleration?
- a= Net force/mass
- What is Newton's Third Law?
- Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first