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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?
How many sig figs does 5.00 have?
What does N represent for units?
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?
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

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