Center of Mass - AP Physics 1: Kinematics Review Supplement

The video covers two center of mass problems to help students prepare for the AP Physics 1 exam. The first problem involves a balloon and a massless rope, while the second problem deals with a person sliding on frictionless ice. Both problems emphasize the concept of zero net external force and its implications on the system's center of mass. The video concludes with tips on simplifying complex physics problems.

What is the initial distance between the centers of mass of the balloon and the person in the first problem?

• 2 times Capital R

• Capital R

• 4 times Capital R

• 3 times Capital R

Why does the center of mass of the balloon-person system remain stationary relative to the Earth?

• Because the person is not moving

• Due to zero net external force on the system

• Because the balloon is heavier

• Due to the massless rope

In the second problem, what is the initial velocity of the system before the book is thrown?

• 8 meters per second north

• 3 meters per second east

• 0 meters per second

• 5 meters per second west

What principle is used to solve the second problem involving the textbook?

• Conservation of energy

• Newton's second law

• Conservation of momentum

• Archimedes' principle

What is the final velocity of the center of mass of the system after the book is thrown?

• 3 meters per second east

• 8 meters per second north

• 0 meters per second

• 5 meters per second west

How are the two center of mass problems similar?

• Both involve moving objects

• Both have zero net external force

• Both are about frictionless surfaces

• Both involve ropes

What should you do if a multiple choice problem seems algebraically complex?

• Skip the problem

• Guess the answer

• Use a calculator

• Look for a simpler solution