PHYSICS LAB FINAL (PRE-LAB QUESTIONS)

The coefficient of friction can be zero, meaning there is no friction between the two surfaces. True False

false

The coefficient of static friction is always _______ the coefficient of kinetic friction. equal to greater than less than

greater than

If the force applied on an object is greater than the force of kinetic friction the object will travel with ________ velocity. decreasing constant increasing

increasing

The frictional force that holds an object in place is called ______ friction. kinetic standing static dynamic

static

A quantity that has only a magnitude with proper units is called a: scalar vector

scalar

Which of the following quantities are scalars. speed velocity displacement distance mass weight

speed distance mass

If a hanging spring obeys Hooke's Law, then the graph of the Force exerted by the spring vs. the extension would be: upward curve downward curve straight line with negative slope horizontal line a straight line with a positive slope

straight line with negative slope

The relationship between the Period (T) caused by the oscillation of the mass on the end of a hanging spring and the mass (m) is: 2p(m/k)2 T=√(2pm/k) T=2p√(k/m) T=2p√(m/k)

T=2p√(m/k)

A spring with a spring constant of 110N/m is stretched by 12 cm. How much force is applied to the spring to stretch it? -6.6N -1320N -13.2N 13.2N -2.5N

-13.2N 13.2N

A mass of 175g is placed on the end of a spring of unknown spring constant. The spring is stretched beyond equilibrium and released. The time to complete one oscillation (1 period) is .725s. What is the spring constant? 128N/m 2N/m -13N/m 13N/m -128N/m

13N/m

The relationship between the change in length (Δx) of the spring and the force (F) the spring exerts to stretch or compress the spring is: F=-kx F= ½ kx F=k/x F=-kx2 F=-x/k

F=-kx

When finding the magnitude of the sum of two vectors, you can directly add the magnitudes of the two vectors. True False

False

If you drop a feather and penny in air, which one would hit the ground first? They will hit at the same time. The penny will hit first. The feather will hit first.

The penny will hit first.

If you drop a feather and penny in a vacuum ( no resistance), which one would hit the ground first? They will hit at the same time. The penny will hit first. The feather will hit first.

They will hit at the same time.

Given the kinematics equation for the motion of an object falling from rest, x=.5g*t2), what kind of relationship is predicted between x and t? (select all that apply) displacement, x, is proportional to time, t. displacement, x, is proportional to the square of the time, t2. displacement, x, has a linear relationship with time, t. displacement, x, and time, t, obey a power law. x=k*t+b, where k and b are constants. x=k*t2, where k is a constant. x=k*t, where k is a constant

displacement, x, is proportional to the square of the time, t2. displacement, x, and time, t, obey a power law. x=k*t2, where k is a constant.

The frictional force that slows an object down while in motion is called ______ friction. kinetic static dynamic standing

kinetic dynamic

A quantity that has both a magnitude with proper units as well as a directions is called a vector scalar

vector

Which of the following quantities are vectors: weight velocity mass speed displacement distance

weight velocity displacement

According to kinematics (x=.5g*t2), the acceleration is dependant only upon the distance that the object fell the mass of the object the shape of the object where the object is located.

where the object is located.

If you plotted x vs. t2, for an object falling from rest (assuming down to be positive), what should the graph look like? y-intercept is zero (goes through origin) positive slope curve with increasing slope y-intercept is negative curve with decreasing slope negative slope y-intercept is positive straight line

y-intercept is zero (goes through origin) positive slope straight line