2015 #1 Free Response Question - AP Physics 1 - Exam Solution

The video tutorial covers a problem from the 2015 AP Physics exam involving blocks connected by a string over pulleys. It explains how to draw free body diagrams, derive the acceleration of the blocks, and the impact of adding a third mass. The importance of accurately drawing and labeling diagrams is emphasized, along with understanding the concepts without relying on numbers.

What is the primary reason for drawing free body diagrams in physics problems?

• To avoid solving the problem mathematically

• To visually represent forces acting on an object

• To confuse the examiner

• To make the problem look more complex

Why do the tension forces in the string have the same magnitude for both blocks?

• Because the blocks are of equal mass

• Because the string and pulleys are massless and frictionless

• Because the blocks are stationary

• Because the blocks are moving at the same speed

How do you determine the positive direction for analyzing the acceleration of the blocks?

• By choosing the direction of the larger block

• By choosing the direction of the smaller block

• By choosing the direction opposite to the expected acceleration

• By choosing the direction in which the blocks are expected to accelerate

What happens to the acceleration of the system when a third block is added?

• The acceleration becomes zero

• The acceleration remains the same

• The acceleration decreases

• The acceleration increases

How does adding a third block affect the tension forces in the system?

• It increases the tension forces

• It decreases the tension forces

• It introduces new tension forces with different magnitudes

• It has no effect on the tension forces

Why is it important to understand the concepts without relying on numbers?

• Because it is a requirement of the AP exam

• Because numbers are difficult to work with

• Because it helps in solving problems conceptually

• Because numbers are not allowed in exams

What is the effect of the third block on the net force acting on the system?

• It makes the net force zero

• It does not change the net force

• It decreases the net force

• It increases the net force