Physics Lab Final

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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


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