Review AP Physics Mechanics

Which of the following correctly ranks the energy dissipated in the three resistors during a given time interval?

• E₃₀₀ > E₂₀₀ > E₁₀₀

• E₃₀₀ > E₁₀₀ > E₂₀₀

• E₂₀₀ > E₃₀₀ > E₁₀₀

• E₂₀₀ > E₁₀₀ > E₃₀₀

Tags

NGSS.HS-PS3-1

A car takes 4 s to come to rest while traveling 20 m at constant acceleration. Can the speed of the car immediately before the brakes were applied be determined without first determining the car's acceleration?

• Yes, by dividing the distance (20 m) by the time (4s).

• Yes, by determining the average speed while braking and doubling it.

• No, because the acceleration is need to use standard kinematics equations.

• No, because the fundamental relationship that defines velocity contains acceleration.

Tags

NGSS.HS-PS2-1

While traveling in an elliptical orbit around the Sun, Mars gains speed when it is closest to the Sun. Which of the following best explains this phenomenon?

• As Mars gets closer to the Sun, the Mars-Sun system loses potential energy and gains kinetic energy.

• A component of the gravitational force is perpendicular to the direction of motion and causes a gain in speed.

• Torque exerted on Mars by the Sun during this segment increases the Mars-Sun system's angular momentum.

• The centripetal force exerted on Mars is greater than the gravitational force during this segment of the orbit.

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

A marble moves across the floor for a marble moving in one dimension. Which describes the motion of the marble?

• Rolling along the floor and bouncing off a wall.

• Rolling down one side of a bowl and then rolling up the other side.

• Rolling up a ramp and then rolling back down.

• Falling and then bouncing elastically off a hard floor.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A race car goes around a flat, unbanked circular track and gradually increases speed as it completes one full trip around the track. Which of the following can explain why the car gains speed?

• Energy stored in the fuel is converted to mechanical energy.

• A component of the frictional force exerted by the ground on the tires is directed toward the center of the circle.

• A component of the frictional force exerted by the ground on the tires is in the direction of motion.

• The car's velocity and acceleration are perpendicular.

Tags

NGSS.HS-PS3-2

Students use standing harmonic waves in an open tube to create the following graph. How could the graph be used to calculate the speed of sound in air?

• There is no way to use the graph to calculate speed

• Slope of the best-fit line between 0.2 and 0.4 m wavelengths

• 1/Slope of the best-fit line between 0.2 and 0.4 m wavelengths

• Area under the curve of the trapezoidal region between 0.2 and 0.4 m

Tags

NGSS.HS-PS4-1

What is the net work done on the object over the distance shown?

• F_od

• 3F_od/2

• 2F_od

• 4F_od

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

A child of mass M is on a platform of mass 2M that is rotating, frictionlessly, counterclockwise. Which describes an action that will increase the angular speed of the platform-child system and gives the correct reason why?

• The child walks inward, increasing the total angular momentum.

• The child walks inward, decreasing the rotational inertia.

• The child walks outward, increasing the total angular momentum.

• The child walks outward, decreasing the rotational inertia.

The figure shows the forces on a block sliding on a surface. The coefficient of the block and surface is 0.20. The acceleration of the block is most nearly

• 1.0 m/s² right

• 1.0 m/s² left

• 2.0 m/s² right

• 2.0 m/s² left

Tags

NGSS.HS-PS2-1

Students are asked to use the set up shown to determine the mass of block B. They plan to measure the time it takes A to reach the floor. Assuming a light string and a light pulley, what other measurements must they make to determine B's mass?

• Only the mass of A

• Only the distance A falls to reach the floor

• Only the mass of A and the distance it falls to reach the floor

• The mass of A, the distance A falls, and the radius of the pulley

Tags

NGSS.HS-PS2-1