2017 #2 Free Response Question - AP Physics 1 - Exam Solution

The video tutorial covers question #2 from the 2017 AP Physics One exam, focusing on determining the coefficient of static friction between a wood board and block. It includes a detailed derivation of the equation for static friction, an explanation of the experimental setup and procedure, and a discussion on hypothesis testing. The tutorial also provides insights into grading criteria and offers advice for students on how to approach similar problems.

What is the primary goal of the experiment described in the video?

• To measure the angle of inclination of a board

• To determine the coefficient of static friction between a wood board and block

• To find the speed of a block sliding down an incline

• To calculate the mass of a wooden block

Which force needs to be broken into components when analyzing the free body diagram?

• Force of static friction

• Centripetal force

• Normal force

• Force of gravity

What is the correct expression for the force of gravity parallel to the incline?

• mass × acceleration due to gravity × cos(Theta)

• mass × acceleration due to gravity × sin(Theta)

• mass × acceleration due to gravity × tan(Theta)

• mass × acceleration due to gravity × Theta

What equipment is suggested for measuring the incline angle in the experiment?

• A stopwatch

• A phone leveling app

• A ruler

• A protractor

Which method is recommended to reduce experimental uncertainty in the procedure?

• Using a different type of wood

• Increasing the incline angle

• Calibrating the phone leveling app

• Using a heavier block

What conclusion can be drawn from the lab data regarding the hypothesis about static and kinetic friction coefficients?

• They are not equal

• They are both zero

• They are both infinite

• They are equal

What anomaly was observed in Lab Group 5's data?

• Their static friction coefficient was zero

• Their kinetic friction coefficient was much greater than the static friction coefficient

• Their data was missing

• Their data was identical to other groups

How does adding a metal disk to the block affect the coefficient of static friction?

• It remains the same

• It doubles the coefficient

• It decreases the coefficient

• It increases the coefficient

What reasoning is given for the coefficient of static friction remaining unchanged with added mass?

• The mass is not in the equation for static friction

• The mass cancels out with gravity

• The mass is too small to affect friction

• The mass increases the normal force

What is a valid argument for the coefficient of static friction changing with increased normal force?

• The surfaces become rougher

• The surfaces remain unchanged

• The surfaces become magnetic

• The surfaces become smoother