AP Physics C: Dynamics Review (Mechanics) - Newton's 3 Laws, Friction, Equilibrium

The video tutorial covers key concepts in AP Physics C mechanics, focusing on Newton's laws, units, and basic forces like gravity, normal force, and tension. It explains friction, both static and kinetic, and introduces free body diagrams with steps to solve related problems. The tutorial also discusses drag force and terminal velocity, providing equations and examples to illustrate these dynamics concepts.

What is the primary condition for an object to remain at rest or in uniform motion according to Newton's first law?

• It must be in a non-inertial reference frame.

• It must be acted upon by a net external force.

• It must have zero mass.

• It must be in an inertial reference frame.

Which of the following correctly describes Newton's third law of motion?

• The force of gravity is always downward.

• An object at rest stays at rest unless acted upon by a force.

• Force equals mass times acceleration.

• For every action, there is an equal and opposite reaction.

What is the unit of force in the International System of Units (SI)?

• Joule

• Watt

• Newton

• Pascal

Which force is always perpendicular to the surface of contact?

• Tension force

• Normal force

• Gravitational force

• Frictional force

What is the relationship between static and kinetic friction for any two surfaces?

• Static friction is unrelated to kinetic friction.

• Static friction is equal to kinetic friction.

• Static friction is less than kinetic friction.

• Static friction is greater than kinetic friction.

What is the first step in solving a free body diagram problem?

• Sum the forces.

• Break forces into components.

• Identify positive directions.

• Draw the free body diagram.

In translational equilibrium, what is the net force acting on an object?

• Equal to the object's velocity.

• Equal to the object's mass.

• Equal to zero.

• Equal to the object's weight.

What is the drag force primarily dependent on?

• The mass of the object.

• The shape and surface texture of the object.

• The color of the object.

• The temperature of the object.

What happens to an object when it reaches terminal velocity?

• It moves at a constant velocity.

• It accelerates indefinitely.

• It stops moving.

• It moves in a circular path.

Which of the following is NOT a factor in the equation for terminal velocity?

• Color of the object

• Density of the medium

• Drag coefficient

• Mass of the object