Physics Lab Final
friction definition
force that opposes motion of an object
centripetal force definition
forces responsible for uniform circular motion that are directed toward the center of path (not a real force)
When finding the magnitude of the sum of two vectors, you can directly add the magnitudes of the vectors
false
The coefficient of friction can be zero, meaning there is no friction between the two surfaces
false, there is always friction
static friction
force that keeps an object in place
kinetic (dynamic) friction
friction of motion, slows down an object as it moves
The coefficient of static friction is always _______ the coefficient of kinetic friction
greater than
A specific pendulum has a period of T, given by the equation above. If the length of the string, L, is increased, the period will
increase
If the force applied on an object is greater than the force of kinetic friction the object will travel with ________ velocity
increasing
A specific pendulum has a period of T, given by the equation above. IF the angle is increased from 2 degrees to 4 degrees, the period will
remain the same
A specific pendulum has a period of T, given by the equation above. IF the mass of the pendulum, m, is decreased, the period will
remain the same
simple harmonic motion
restoring force that drives pendulum back to equilibrium after it has been displaced
A quantity that has only a magnitude with proper units is called a
scalar
What are the units for the period of a pendulum?
seconds
According to Newton's 2nd Law, what will happen to the centripetal force if you increase the radius of rotation?
the centripetal force will decrease
period definition
the time is takes to make one complete oscillation
The mass moves in a horizontal circular path of radius R with constant speed v. This motion is called
uniform circular motion
speed characteristics
Scalar, Only tells you how fast the object is moving, S=distance/Δt
velocity characteristics
Vector, Gives information about how fast the object is moving as well as in what direction, V=displacement/Δt
how to find total displacement of vectors analytically
add x components together and y components together then use pythagorean theorem to find magnitude. use tan-1(y/x) to find direction
Which of the following quantities are scalars
distance, mass, speed
analysis of velocity vs. time graphs (direction)
Above the t-axis = moving in positive direction, Below the t-axis = moving in negative direction
analysis of position vs. time graphs
Constant slope=constant speed, Increasing slope=speeding-up, Decreasing slope=slowing-down, Slope changes direction=change in direction, Any change in the slope indicates acceleration
newton's 2nd law
F=ma (linear), F=m(v²/R) (circular)
The term "centripetal force" refers to an actual force that you can label on a free-body diagram
False
Newton's 3rd Law
For every action there is an equal and opposite reaction
analysis of velocity vs. time graphs (velocity)
Graph approaching the t-axis = slowing down, Graph moving away from the t-axis = speeding-up
analysis of velocity vs. time graph (acceleration)
The slope of the line represents the acceleration, The magnitude of slope=magnitude of acceleration, The direction of the slope=direction of acceleration
centripetal acceleration
change in velocity over time, always accelerating (a=v²/R)
A specific pendulum has a period of T, given by the equation above. IF the pendulum is moved from the earth where the g is 9/8 m/s2, to Jupiter where it is 26.0 m/s2, the period of the pendulum will
decrease
3 parts of motion
displacement, velocity, acceleration
period characteristics
independent of amplitude or mass, depends on length of pendulum and acceleration due to gravity
two types of friction
kinetic and static
how to find total displacement of vectors graphically
placing the tail of one vector at the head of the other and find resultant
A quantity that has both a magnitude with proper units as well as a directions is called a
vector
acceleration characteristics
vector quantity whose direction is parallel to the velocity, Slows down=acceleration and velocity are in opposite directions, Speeds up=acceleration and velocity are in the same direction, CHANGES DIRECTION
Which of the following quantities are vectors
velocity, weight, displacement