AP Physics System Block Earth

A 5 kg ball is lifted 12 m above the ground. The ball:

• gains elastic potential energy

• gains gravitational potential energy

• gains kinetic energy

• gains mechanical energy

Tags

NGSS.MS-PS3-2

Which of the following objects has the most kinetic energy?

• A 20 kg toddler running at 5 m/s

• A 50 kg toddler running at 30 m/s

• A 90 kg toddler running at 30 m/s

• A 100 kg toddler running at 5 m/s

Tags

NGSS.HS-PS3-2

A student is asked to determine the work done on a block of wood when the block is pulled horizontally using an attached string. The student is supplied with a spring scale, a stopwatch, and a meterstick. Which of the following graphical analysis techniques will allow the student to determine the work done on the block by the string?

• Graphing the force as a function of time and calculating the slope

• Graphing the force as a function of time and calculating the area under the curve

• Graphing the force as a function of distance and calculating the slope

• Graphing the force as a function of distance and calculating the area under the curve

An object is released from rest at a height H near and above the surface of Earth. As the object falls toward the surface, Earth’s atmosphere exerts a resistive force on the object such that it reaches a terminal velocity before it reaches the ground. Which of the following claims is true? Select two answers.

• The system consisting of only the object is an open system.

• Earth’s atmosphere does negative work on the object as it falls toward the surface.

• The change in the object’s kinetic energy from the instant it is released from rest, to the instant it reaches terminal velocity, is zero.

• The total mechanical energy of the object-Earth system remains constant at all times in which the object is in motion.

Tags

NGSS.HS-PS2-2

NGSS.HS-PS2-4

A rubber ball with mass 0.20 kg is dropped vertically from a height of 1.5 m above a floor. The ball bounces off of the floor, and during the bounce 0.60 J of energy is dissipated. What is the maximum height of the ball after the bounce?

• 0.30 m

• 0.90 m

• 1.19 m

• 1.56 m

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Which of the following is true for a system consisting of a mass oscillating on the end of an ideal spring?

• The kinetic and potential energies are equal to each other at all times.

• The kinetic and potential energies are both constant.

• The maximum kinetic energy and maximum potential energy are equal, but occur at different times.

• The maximum potential energy is achieved when the mass passes through its equilibrium position.

A rock is lifted for a certain time by a force F that is greater in magnitude than the rock's weight W. The change in kinetic energy of the rock during this time is equal to the

• work done by the net force (F - W)

• work done by F alone

• work done by W alone

• difference in the momentum of the rock before and after this time

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

NGSS.HS-PS3-2

An object is projected vertically upward from ground level. It rises to a maximum height H. If air resistance is negligible, which of the following must be true for the object when it is at a height H/2?

• Its speed is half of its initial speed.

• Its kinetic energy is half of its initial kinetic energy.

• Its potential energy is half of its initial potential energy.

• Its total mechanical energy is half of its initial value.

True/False: A conservative force does not change the mechanical energy of a system

• True

• False

Tags

NGSS.HS-PS3-2

Which position has the most potential energy?

• A
• G
• C
• D

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2