Energy in Systems

Front

At which point does the bowling ball have the most kinetic energy? Options: W, X, Y, Z

Back

W

Front

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. If both boats gain speed at the same rate, why does motorboat 1 have more kinetic energy?

Back

It has more mass.

Front

What gives the cars their potential energy in a downhill cart race?

Back

gravity

Front

Which variables affect an object's gravitational potential energy?

Back

mass and height

Front

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

Back

D

Front

What happens to the mechanical energy when raising the box using the pulley?

Back

4 joules of mechanical energy are converted into heat energy due to friction.

Front

According to the law of conservation of energy, what happens to the energy of a car as it travels from position A to position C when the brakes are applied?

Back

The total amount of energy remains the same, but it is transformed from kinetic energy to thermal energy as the brakes are applied.

Front

The law of conservation of energy states that:

Back

energy cannot be created and it cannot be destroyed.

Front

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

Back

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

Front

If 100 J of electrical energy enter an incandescent bulb and 5 J of light energy leave, how many joules of heat energy leave the bulb?

Back

95 J