Physics lab 1114

A specifc 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.

If you drop a feather and penny in air, which one would hit the ground first?

The penny will hit first.

Use the equation and picture above to answer the questions in this quiz. A specifc pendulum has a period of T, given by the equation above. IF the length of the string, L, is increased, the period will

increase

What are the units for the period of a pendulum from the equation above?

s

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

Kinetic

Based solely on the angular speed vs. time graph, is the total mechanical energy of the platter/mass system conserved?

No

Does the mass return to its initial height above the floor at time t2

No

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.

The frictional force that holds an object in place is called ______ friction.

Static

Given the equation above, describe the graph that you would obtain if you plotted acceleration vs. the mass ratio.

Straight line through the origin

The total angular momentum of a system of rotating objects is conserved if the vector sum of the torques of all the external forces acting on the system is zero.

True

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 - positive slope - Straight line

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

Considering our pulley system with a mass falling at a constant acceleration, what should the general shape of its position vs. time graph look like.

A curve with an increasing slope.

Considering our pulley system with a mass falling at a constant acceleration, what should the general shape of its velocity vs. time graph look like.

A straight line.

A specifc 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.

Refer to the graph of rotational speed vs. time for the platter/mass system to answer the questions 1-4 in this quiz. The Gravitational Potential Energy of the mass m at time t1 is _____________ the gravitational potential energy of the mass m at time t3.

Equal too

The coefficient of friction can be zero, meaning there is no friction between the two surfaces. T/F

False

The coefficient of static friction is always _______ the coefficient of kinetic friction.

Greater than

The translational kinetic energy of the mass m and the rotational kinetic energy of the platter at time t1 is _________________ the translational kinetic energy of the mass m and the rotational kinetic energy of the platter at time t3.

Greater than.

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

Increasing

Given the equation above, the slope of the graph of acceleration vs. the mass ratio is

The acceleration due to gravity.

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.

What is the purpose of the friction rider?

To counter balance the kinetic friction in the system.

According to kinematics (x=.5g*t2), the acceleration is dependant only upon

Where the object is located.