Work and Energy Quiz

Which of the statements below relates to the kinetic and potential energies of the systems?

• 
  

  Potential energy of A is at its minimum and kinetic energy of A is at its maximum

• Potential energy of C is at its minimum and kinetic energy of C is at its maximum

• Potential energy of B is at its minimum and kinetic energy of B is at its maximum

• Potential energy of D is at its minimum and kinetic energy of D is at its maximum

Answer explanation

The correct choice states that potential energy of D is at its minimum and kinetic energy of D is at its maximum, indicating that system D is in a state of maximum motion and minimum stored energy, which is a key principle in energy conservation.

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

NGSS.MS-PS3-4

A robotic arm lifts a stack of cafeteria trays weighing 62 newtons (N). It moves the trays 2 meters (m). How much work has the robotic arm performed?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS3-5

Jake’s toy truck has a mass of 3 kilograms (kg). Jake pushes the truck with a force of 10 newtons (N). How much work has Jake done on the truck when he pushes it for 2 meters?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS3-5

Alice lifted 5 bricks a height of 4 meters (m) each. Each brick weighed 110 newtons (N). What was the total amount of work for Alice to move the bricks?

Mathematical Equivalence

ON

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Which describes the amounts of energy found in the forms of heat and chemical energy in a plant?

• Chemical and heat energy are equal to one another.

• Their sum is equal to the amount of sunlight energy transformed.

• The amount of each is equal to the amount of sunlight energy transformed.

• Chemical and heat energy equal half of the amount of sunlight energy absorbed.

Answer explanation

In photosynthesis, plants convert sunlight energy into chemical energy (glucose) and heat energy. The total energy produced (chemical + heat) equals the sunlight energy transformed, making the second choice correct.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

It took 500 Newtons of force to push a car four meters. How much work was done?

Mathematical Equivalence

ON

Tags

NGSS.MS-PS2-2

Energy due to motion is ____________ energy. 

• Potential 

• Energy

• Kinetic

• Friction

Answer explanation

Energy due to motion is called kinetic energy. It is the energy an object possesses due to its movement, distinguishing it from potential energy, which is stored energy based on position.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

What is Mechanical Energy a sum of?

• Kinetic Energy and Thermal Energy

• Potential Energy and Chemical Energy

• Kinetic Energy and Potential Energy

• Thermal Energy and Chemical Energy

Answer explanation

Mechanical Energy is the sum of Kinetic Energy and Potential Energy. Kinetic Energy is the energy of motion, while Potential Energy is stored energy based on position. Together, they represent the total mechanical energy in a system.

How does the Potential Energy of an object change as it falls towards the Earth?

• It increases

• It decreases

• It remains constant

• It first decreases, then increases

Answer explanation

As an object falls towards the Earth, its height decreases, leading to a decrease in gravitational potential energy. Therefore, the correct answer is that the potential energy decreases.

Tags

NGSS.MS-PS3-2

If two objects have the same mass but different velocities, how does their Kinetic Energy compare?

• The object with the higher velocity has less Kinetic Energy.

• The object with the lower velocity has more Kinetic Energy.

• The object with the higher velocity has more Kinetic Energy.

• Their Kinetic Energies are the same.

Answer explanation

Kinetic Energy (KE) is given by the formula KE = 1/2 mv². Since both objects have the same mass, the one with the higher velocity (v) will have a greater KE due to the square of the velocity, making it larger.

Tags

NGSS.MS-PS3-1