Flashcards in Chapter 1 Deck (44)
How is physics an experimental science?
It involves measurements and experiments
What would a pattern be?
a physical theory
What is a physical law?
A theory that held true
How should you solve a physics problem?
Find givens and what you need to find, set up the equations, execute by plugging numbers and solving, and evaluate the results
What are the 3 fundamental quantities of physics?
Length, time, and mass (meter, second, and kilogram)
What is the purpose of significant figures?
Finding uncertainty in a measument
What can scientific notation be useful for?
Indicating the number of significant figures
What is the rule for an even number followed by a 5?
It stays the same
What is the rule for an odd number followed by a 5?
it rounds up
When doing math, what kind of sig figs get priority?
The least number of sig figs. In addition/subtraction you use the least number of decimals
What is an order of magnitude?
A quick calculation for a general idea
How does an oder of magnitude work?
You compare 2 numbers in scientific notation to the square root of 10 and round
What is the square root of 10?
What is accuracy?
The closeness to a true value
What is precision?
The number of sig figs used
What is a scalar?
A quantity specified without direction
What is a vector?
A quantity specified that does have direction. It's specified as force and velocity
What are equal vectors?
Vectors with equal magnitude and direction
What is a negative vector?
A vector with opposite direction but the same magnitude
How do you add vectors graphically?
put them head to tail. They're commutative
How do you subtract vectors graphically?
Put them head to head
What is an accurate way to add vectors?
What is a unit vector?
A vector with a magnitude of 1 with no units. You use them with x/y/z to do cartesian coordinates
How does a scalar dot product work?
Foiling their unit vectors
What quantity usually serves as a vector's magnitude?
What is the direction of a vector?
What is the angle between 2 parallel vectors?
What is the angle between 2 antiparallel vectors?
How does multiplication with scalar quantities effect a vector?
It changes its magnitude but not direction. Direction is only changed when the scalar is negative
What is the Y component of a vector?
A x Sin (angle)
What is the X component of a vector?
A x Cos (angle)
How do you find the magnitude of angle A?
sqrt(Ax^2 + Ay^2)
How do you find the angle of a vector with its components?
The components can be ____ or ____
Positive or Negative
What determines the signs of the components?
How do you add vectors with components?
You add the X and Y components, use the Pythagorean theorem, and then take the arctan of the components
What does ihat indicate?
The x components
What does jhat indicate?
The y components
What does khat represent?
The z components
What does the dot/scalar product provide?
A scalar result
What is the dot product formula?
Vector A x Vector B=AB x Cos (Chi)
When is the scalar product negative?
When the angle is larger than 90 degrees
What is the scalar product of 2 perpendicular vectors?