Energy in Systems Quizs

When raising the box using the pulley, 4 joules of mechanical energy are converted into heat energy due to friction. What happens to the mechanical energy?

• When raising the box using the pulley, 4 joules of mechanical energy are converted into heat energy due to friction.

• When raising the box using the pulley, 4 joules of mechanical energy are destroyed.

• When raising the box using the pulley, 4 joules of mechanical energy are broken down into protons, neutrons, and electrons.

• When raising the box using the pulley, 4 joules of mechanical energy are transformed into water.

Based on the information in the table, which child has the greatest potential energy at the top of the slide?

• A

• B

• C

• D

Measuring the average energy of motion of the particles in a substance is the same as measuring the substance's

• temperature.

• heat capacity.

• mass.

• pressure.

A student wants to measure the temperature change of water after adding a 5 cm³ block of copper to container 1 and a 20 cm³ block of copper to container 2. Both blocks of copper were heated to 40°C before they were added to the water. The image below shows the experiment immediately after adding the copper. What should be expected from this experiment?

• A. The temperature should increase more in container 2 because the 20 cm³ block contains more thermal energy.

• B. The temperature should decrease more in container 2 because the 20 cm³ block contains more thermal energy.

• C. The containers will have the same amount of temperature change because the 20 cm³ block and the 5 cm³ are made from the same element.

• D. The temperature should increase more in container 1 because the 5 cm³ block contains more thermal energy.

A pitching machine is used to pitch two balls. The speed of both balls is 94 km/hr. The mass of one ball is 5 grams, and the mass of the other ball is 50 grams. Since both balls are traveling at the same speed, which of the following is true?

• A. Neither ball has any kinetic energy.

• B. The balls have the same kinetic energy.

• C. The 50-gram ball has more kinetic energy than the 5-gram ball.

• D. The 5-gram ball has more kinetic energy than the 50-gram ball.

A group of students is having an annual downhill cart race. The unpowered carts, like the one shown below, are lined up at the top of a hill. What gives the cars their potential energy?

• A. their wheels

• B. gravity

• C. their speed

• D. friction

Two motorboats are traveling down a river. Motorboat 1 has a mass of 6,000 kg, and motorboat 2 has a mass of 1,500 kg. The graph below shows the kinetic energies of the boats as they gain speed. If both boats gain speed at the same rate, why does motorboat 1 have more kinetic energy?

• A. It has more mass.

• B. Its length is greater.

• C. It sits up higher in the water.

• D. It encounters more air resistance.

The heat from the Sun must pass through the vacuum of space before it reaches the Earth. Which process is illustrated in this example?

• A. conduction

• B. convection

• C. radiation

• D. induction

In order to increase the gravitational potential energy of a roller coaster car, you could...

• increase the car's height

• decrease the car's height

• increase the car's velocity

• decrease the car's mass

Spinning wind turbine blades have kinetic energy. Wind turbines transform this energy into electric energy and heat energy in a closed system. Which of the following statements about this energy transformation is true?

• Half of the kinetic energy is transformed into electric energy and heat energy.

• Half of the heat energy is transformed into electric energy.

• All of the kinetic energy is transformed into electric energy and heat energy.

• All of the heat energy is transformed into electric energy.