AP Physics Semester 1 Review

Front

What is tension in a string when a ball is moving in a horizontal circle?

Back

The tension in the string is greater than mg, always.

Front

How is torque calculated when a force is applied at an angle to a rod?

Back

Torque is calculated as τ = rF sin(θ), where r is the distance from the pivot, F is the force, and θ is the angle between the force and the lever arm.

Front

What happens to kinetic energy when momentum doubles?

Back

The kinetic energy increases more than doubles.

Front

What is the net force on an object at rest on an inclined plane?

Back

The net force is 0 N.

Front

What is the net force on a ball at the halfway point of its upward motion in the absence of air resistance?

Back

The net force on the ball is mg.

Front

Define torque.

Back

Torque is a measure of the rotational force applied to an object, calculated as the product of the force and the distance from the pivot point.

Front

What is the relationship between speed and momentum?

Back

Momentum is directly proportional to speed; if speed increases, momentum increases.

Front

Explain the concept of centripetal force.

Back

Centripetal force is the net force that acts on an object moving in a circular path, directed towards the center of the circle.

Front

What is the formula for kinetic energy?

Back

Kinetic energy (KE) is given by the formula KE = (1/2)mv², where m is mass and v is velocity.

Front

What is the significance of the angle in torque calculations?

Back

The angle affects the effectiveness of the force in producing torque; torque is maximized when the force is applied perpendicular to the lever arm.